My son is 17 teen year old male his height is 5'6 and he weights 105lb is this underweight.?

my name is Naomi Jones i am 22 my younger brother joe 17 is your age he weighs 107lb and he is height 5'7 so honestly i don't think your that much underweight but your a 17 year old male why the heck are you worrying about your weight its generally girls worrying anyway hope i helpedOmG!!!! im 10 years old i way that you should be like 180 your something your a wimp i wouldn't date u u should gain