Why do I have very little body hair but I'm 18?

First if you guys say its genes, all of my brothers who reached puberty have legs and arms that hairy AF and same with my dad but I don't and I'm 18 and I still only have my hair grown on my head (not facial) and pelvic area but hardly any hair in elsewhere in the body but why is that?
Why do I have very little body hair but I'm 18?
2
5
Add Opinion