I've been growing my beard for a year now.
Thats great, I have a really long one myself, I think that people usually only young adult males are able to grow beards. It would be weird seeing a baby grow a beard. 
Yes, also a woman!
Indeed, actually back in ancient caveman times it was a common trait for humans to have hair on their face and entire body like the hair you see on gorillas.
I guess it kept them warm.
It sure did, for most of that time it was eventually lost over time and humans became more hairless and they depended more of the fur coats of animals for warmth. 
So they pretty much evolved to have less hair. How interesting.
Well somewhat, Today from childhood onward both sexes hair pretty much covers almost the entire area of the body.