Rock Climbing is a sport that gives you a lot of control over risk. Once you understand the technical safety aspects, you can evaluate risks of a particular course of action.
Climbing mellow routes with a top rope is quite low risk.
It’s a longevity sport, at crags and gyms it’s pretty normal to see people over 50 still at it.
I have many friends with nipple piercings.
You can’t tell through a shirt.
Nobody is scrutinizing the shape of your nipples through a t shirt