If a parent has to tell her / his kid how to manage his love life - he is in no way ready for marriage. He has not grown up yet.
I envision meddlesome M-i-Ls on both sides.
If the son went online and asked if he’s too young to get married, that’s one thing. But it’s THE mother asking that question!! Yikes!!
The son should move out ASAP. Become a man, prove that he can provide, find out a bit about himself. Then and only then should he entertain the thought of marriage. Right now he’s mom’s little boy.