15 is not a little boy. 15 is biologically a man and back in the 1800s was expected to have his own house and family by then. It is only because we coddle our children that 15 year olds are not fully mature yet.
this isn’t the 1800’s 15 is a BOY in 2017. Heck 20 is practically still a boy these days
Sadly, there are some 40+ that are still not mature :/