he's a teen, a teenager and maybe a young adult....depending on the situation being spoken about, if he were my son, he would be ''My boy'' at 19, even if serving in Afghanistan!!!A young man, is a man from 20- 25 years old, certainly not a boy in his teens...even a 16 year old is NOT a young man....sorry!
Would you refer to a 19-year-old male stationed in Afghanistan as a boy?
*the avg age of all those guys that died in VietNam...19 is what I've heard...