Adult masculine have no armpit tresses at adjectives?

is there some medical or other reason that an adult masculine doesnt grow any armpit hair at all? i do have it,but my son have very little through his 20s,30s,40s,and now has none at adjectives in his 50s. why could this be? he has pretty much facial and leg hair,some chest,his forearm quill is not very noticable,heavy or course. all his spike is black as mine was when younger.
Answers:    -Many factors ,if not genes,process of lifestyle of mother while preganant determined this


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