Inspiring. I read about a 60ish YO woman who walked the Appalachian Trail.
You must be young! I'm in my late 50s and my 50s-60s YO peers frequently do this kind of thing. Most of us are still running (some still do marathons), the ones who had to quit running took up biking. One guy who is 70 teaches an exercise class at the local gym.
103 is old. 60-something? Not so much any more.