By Professor Kevin Lapp
Prof. Lapp is guest blogging on Prawfsblawg, where this post originally appeared.
A foundational, definitional problem for those like me who write about childhood and juvenile justice issues is figuring out who is a child and who is an adult, because rights and responsibilities frequently turn on whether someone is considered an adult or not. The answer, of course, is that it depends. The law considers people to reach maturity at a range of ages: it might be 21 (drink alcohol), 18 (vote), 16 (drive), 10 or 7 (ages of potential criminal responsibility). Of course, age need not be the deciding factor. Determining maturity could turn on capacity instead of age, but the bright line of age is much easier to implement than individual capacity-based inquiries.
The law in all sorts of areas uses this age-based binary approach: people are children until they reach a certain age, at which point they become, or are subject to the same rules as, adults. But however or wherever the line between adults and non-adults is located, a secondary question is becoming more pressing as developmental science teaches us more and more about the process of maturing: are there any categories within the group of people who are legally children (or “not yet adults”) and should the law account for such?
The law in all sorts of areas uses this age-based binary approach: people are children until they reach a certain age, at which point they become, or are subject to the same rules as, adults. But however or wherever the line between adults and non-adults is located, a secondary question is becoming more pressing as developmental science teaches us more and more about the process of maturing: are there any categories within the group of people who are legally children (or “not yet adults”) and should the law account for such?

