Because dht doesn’t gather there. Dihydro testosterone.

Also, we do lose some hair density as we age. The beard usually doesn’t, but the pubes often do. But that’s more a matter of it growing back in slower as the body slows down. I’d say it’s an 8/10 thing where’s there’s visible decrease in pube density.

Used the be a nurse’s assistant, so I’ve seen plenty of naked people lol.

Priorities

IIRC… natural testosterone production leads to a biproduct called DHT. It’s a chemical responsible for many adult male characteristics. Beard hair is different to scalp hair. There is evidence this chemical causes scalp hair loss, but beard and body hair growth