Replying to https://twitter.com/YeenEnjoyer/status/1274453828377722882:

@CircuitYeen @deeannalitaa @joeygllghr @_______2_s__ Nature turns children into adults in a process called puberty. Puberty happens between 10 and 14 years of age.

So the vast majority of "teenagers" are not children, but young adults.