Thanks. I'm 67 and planning the Kilmanjaro climb for my 70th birthday. I'm going to try the Alcatraz swim this year. I just posted an article about Jack LaLanne, who is my current senior exercise hero.
I was exercising 6 hrs/wk (treadmill, swimming, weights, cycling) and feeling pretty good. My 60 yr old fiance and I go on occasional 10 mile hikes. We both were having some trouble sleeping, and then upped the workouts to about 9 hrs/wk. Now I've never felt better and sleep great! Per LaLanne, exercise is much better than any "pill". As for diet, I'm mostly fruits, veggies, some meat, protein shakes but more "how much you eat" than "what you eat". I feel the exercise is primary.
We were pretty healthy to begin with, and I was active prior. The question is, how does this trend hold into one's 70s and 80s? Does one need to worry about overdoing it? (so far, if I have an ache I just "exercise" out of it). There are some cautions out there about long distance swimming and over-exertion.
This article suggests that age is no impediment: https://www.bbc.co.uk/bbcthree/article/bb27dc63-acda-4bb8-981f-988866ace2fd
