Been there. Quit after 22 years after I could not carry my three-year-old daughter up the stairs at the Santa Monica Palisades. They are quite a hike, yes, but I was only 39.
I must say, this 57-year-old me could beat the crap out of even the 30-year-old me. MUCH better shape, much more wind, and a lot less hair to catch in the wind.
Just teasing you.