Im pretty sure by Adolescents they mean at least 16-19
I have not met a 14 year old here who can even write, let alone type properly.
Proof that they dont know how to type
I dont know how many times ive seen people mix "there, they're, and their" and use them wrong. along with "Your, and You're" etc. Ff youre going to write a book, know the simple things first.