At 20, I could do 20 with 25lbs on me.

After a decade of rock climbing, I could do 12 but also a one arm on the right and nearly a one arm on the left. I was climbing consistently 5.13.

At 42, I can't do any. I climb mid 11 and sometimes more.

My cycling and riding have never been too much effect on my pull-ups. Having a youthful and energetic body though...