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The American juvenile justice system is characterized by the overrepresentation of youth of color that is particularly acute for Black children even at young ages. Despite policy solutions targeting this problem, the Black-White gap in juvenile justice involvement continues to widen. Using mixed methods, this study examines rates of disproportionality among younger children (under age 12) in the state of California juvenile justice system alongside stakeholder views on the causes of and solutions for overrepresentation. We find that at each stage of the juvenile justice system the overrepresentation of Black youth increases relative to White youth. Consistent with the literature, stakeholders attribute this problem to early phases of the system (i.e., school discipline, arrests) where more discretion is applied. They also suggest that alternatives to formal systems involvement would help to remedy overrepresentation. These findings lend support to minimum age laws that uniformly exclude younger children from the juvenile justice system altogether.

Dental development has been used to assess whether an individual may be below or above an age that serves as a legal threshold. This study used development of the first and second mandibular molars from a large sample of individuals (N = 2,676) to examine the age threshold for minimum age of criminal responsibility. A bivariate ordered probit model was applied to dental scores following the Moorrees et al. (1963) system, with the addition of a crypt-absent/present stage. Then a 10-fold cross-validation within each of the sexes showed that the bivariate models produce unbiased estimates of age but are heteroskedastic (with increasing spread of the estimates against actual age). To address the age threshold problem, a normal prior centered on the threshold is assumed, and the product of the prior and the likelihood is integrated up to the age threshold and again starting at the age threshold. The ratio of these two integrals is a Bayes factor, which because the prior is symmetric around the threshold, can also be interpreted as the posterior odds that an individual is over versus under the age threshold. It was necessary to assume an unreasonably high standard deviation of age in the prior to achieve posterior odds that were well above “evens.” These results indicate that dental developmental evidence from the first and second molars is of limited use in examining the question of whether an individual is below or over the minimum age of criminal responsibility. As the third molar is more variable in its development than the first two molars, the question of dental evidence regarding the age of majority (generally 18 years) remains problematic.

The elimination of child marriage is a goal that ranks high on the agendas of civil society organizations, national governments, and multilateral institutions. To date, however, there has been very little scholarship on the historical debates over the definition of child marriage. This article examines the history of age-restricted marriage as it was debated during the development of human rights instruments in the post-World War II era. Using archives of the United Nations and affiliated organizations, we detail how and why efforts to establish a universal minimum age for marriage were repeatedly unsuccessful. We illustrate how the current, commonly used definition of child marriage—as marriage before the age of 18—has never been agreed upon in a legally binding international convention but was seemingly established through a discursive innovation that borrowed principles from the 1989 Convention on the Rights of the Child.

Long doubted, the existence of Pleistocene rock art in North Africa is here proven through the dating of petroglyph panels displaying aurochs and other animals at Qurta in the Upper Egyptian Nile Valley. The method used was optically stimulated luminescence (OSL) applied to deposits of wind-blown sediment covering the images. This gave a minimum age of ~15 000 calendar years making the rock engravings at Qurta the oldest so far found in North Africa.

This presentation will outline other examples of international policies aimed at protecting children and adolescents from being targets of tech companies, with a specific focus on the new social media age restrictions in Norway and Australia. In Norway, the government has ramped up its campaign towards enforcing a strict minimum age limit on social media use. It has been proposed that Norway's Personal Data Act which aims at protecting children from harmful content they may encounter online, will be raised from a minimum of 13 to 15 years of age. In 2024, the Australian Parliament passed the Online Safety Amendment (Social Media Minimum Age) Bill 2024, to amend the Online Safety Act 2021. This new Bill establishes a minimum age for social media use and an obligation on providers of an age-restricted social media platform to take reasonable steps to prevent age-restricted users from having an account with the platform. According to this Bill, age-restricted user means an Australian child who has not reached 16 years. In this presentation, the practicalities and challenges in implementing this Bill, will be outlined, based on the initial 12-month experience since its enactment.

Background In Brazil, the older adult population has already surpassed 32 million people (IBGE, 2023). Cognitive decline stands as one of the most important chronic‐degenerative disabling changes, which can generate Major or Mild Neurocognitive Disorders (Bárrios 2020; American Psychiatric Association, 2023). The third most common disease in the older adult population is presbycusis (hearing loss associated with aging) (Homans, 2016) and there is increasing evidence of the relationship between reduced hearing acuity and functional decline, depression, social isolation and cognitive decline and dementias (Livingston, 2020). In this context, it is needed to carry out and improve studies with the elderly population, especially to monitor and describe the aging process, ensuring a greater quality of life during old age. Method Six older adults were evaluated in 2013 and 2023. They underwent medical and neuropsychological evaluation, audiological anamnesis, audiological evaluation and the P300 electrophysiological exam. Result Of the six cases presented here, 2 patients are male and 4 are female. The average age in 2013 was 73.5 years, with a minimum age of 66 and a maximum of 80. In 2023, the average age was 83.5 years. Three showed improvement in their cognitive status, one remained stable and two showed worsening. Recent studies have proven that Mild Cognitive Impairment cases are able to show general improvement or even go into remission (Souza, 2019), which has happened in four out of the six cases. The cases with identified remission of cognitive decline were the only one in which educational years were over 10 (stable case) and one with hearing loss treatment (went into remission). Studying years stimulus can delay cognitive decline in older age (Feldberg, 2021) and the use of hearing aids can also be a protection (Cantuaria, 2024). It was found that P300 latency was increased (latency exceeding 450ms) (Raggi, 2013) in the two cases classified as dementia. Conclusion The study suggests that the result of the non‐invasive electrophysiological test P300 can be a tool to help in the dementia diagnosis.

With the undeniable increase in asylum requests from unaccompanied alleged minors, age estimation of living individuals has become an essential part of the routine work in European forensic centers. This study aims to review the forensic age estimations performed in our center since 2010, to evaluate the state-of-the-art of this practice in Switzerland with the evolution of the methodology according to upcoming recommendations. Our institute's expert reports performed between 2010 and 2022 were retrospectively analyzed. We gathered the following parameters: demographic data, morphological characteristics, alleged age compared with the assessed minimum age, sexual maturation, dental and bone age. When available, we collected personal and family history, medical history, records of torture-related/self-inflicted injuries, and information about eating habits that might affect skeletal development. Data collection amounted to 656 cases. Forensic age estimations ordered by the Swiss Secretariat for Migration (SEM) represented 76.4% of cases, with 23.6% of them ordered by the Court/Public Prosecutor. Most alleged minors were male (94.5%) and came from Afghanistan (53.4%). Adjunction of CT scans of the sternoclavicular joints was necessary in 86.4% of cases. Only 25.2% of our reports concluded on most probable minority, with 55.6% of definite majors; in 19.2% of our cases, minority could not be excluded. This study aspires to further broaden our expertise regarding forensic age estimations. Given the increasing migratory flows, we can expect a notable increase in the frequency of these requests. Consequently, this study aims to promote a multidisciplinary approach and the international standardization of the methodology of these estimations.

Increasing cross-border migration has brought forensic age assessment into focus in recent decades. Forensic age estimation is based on the three pillars: physical and medical constitution, bone age, and tooth age. Part of the bone age examination includes the assessment of the medial end of the clavicles when the hand bones are already fully developed and a minority must be excluded. Recent research has brought MRI to the forefront as a radiation-free alternative for age assessment. However, there exits only a few studies with large sample size regarding the clavicles and with controversies about staging, motion artifacts, and exclusion based on anatomic norm variants. In the current prospective study, 338 central European male individuals between 13 and 24 years of age underwent MRI examination of the sternoclavicular region. Development was assessed by three blinded raters according to the staging system described by Schmeling et al. and Kellinghaus et al. and related to age by descriptive statistics and transition analyses with a cumulative probit model. In addition, reliability calculations were performed. No statistically significant developmental difference was found between the left and right clavicles. Inter-rater agreement was only moderate, but intra-rater agreement, on the other hand, was good. Stage 3c had a minimum age of 19.36 years and appears to be a good indicator of proof of majority. The minimum age of stage 4 was lower compared with other studies, 20.18 years, and therefore seems not to be an indicator of age of 21 years. In conclusion, we confirmed the value of clavicular MRI in the age estimation process. The transition analysis model is a good approach to circumvent the problems of age mimicry and samples that are not fully equilibrated. Given the moderate agreement between raters, a consensus reading is recommended.

Long-lived species such as elephants, whales and primates exhibit extended post-fertile survival compared to species with shorter lifespans but data on age-related fecundity and survival are limited to few species or populations. We assess relationships between longevity, reproductive onset, reproductive rate and age for 834 longitudinally monitored wild female African elephants in Amboseli, Kenya. The mean known age at first reproduction was 13.8 years; only 5 % commenced reproduction by 10 years. Early reproducers (<12.5 years) had higher age-specific fertility rates than did females who commenced reproduction late (15+ years) with no differences in survival between these groups. Age-specific reproductive rates of females dying before 40 years were reduced by comparison to same-aged survivors, illustrating a mortality filter and reproductive advantages of a long life. Overall, 95 % of fertility was completed before 50, and 95 % of mortality experienced by age 65, with a mean life expectancy of 41 years for females who survived to the minimum age at first birth (9 years). Elephant females have a relatively long period (c. 16 years) of viability after 95 % completed fertility, although reproduction does not entirely cease until they are over 65. We found no evidence of increased investment among females aged over 40 in terms of delay to next birth or calf mortality. The presence of a mother reproducing simultaneously with her daughter was associated with higher rates of daughter reproduction suggesting advantages from maternal (and grandmaternal) co-residence during reproduction.

Objectives. To examine the independent and joint effects of state legislation on minimum age for purchasing handguns and background checks on the suicide of young adults aged 18 to 20 years. Methods. We used negative binomial regressions with fixed effects for year and generalized estimating equations for state to estimate the effects of state legislation on annual counts of firearm, nonfirearm, and total young adult suicides in all 50 US states from 1991 to 2020. Results. Minimum age laws decreased the incidence rate of firearm suicide among young adults, an effect that was amplified in states with permit to purchase laws; there was no effect on the nonfirearm or total suicide rate. Permit to purchase laws significantly decreased the young adult firearm suicide incidence rate by 39% (incidence rate ratio [IRR] = 0.61; 95% confidence interval [CI] = 0.51, 0.74) and the overall suicide incidence rate by 14% (IRR = 0.86; 95% CI = 0.75, 0.99), with no effect on the nonfirearm suicide rate. Conclusions. Permit to purchase laws are a more promising avenue for reducing young adult suicides than are age-based restrictions. ( Am J Public Health. 2024;114(8):805–813. https://doi.org/10.2105/AJPH.2024.307689 )