Thank you for he reply! You are a pretty lucky person, I have been doing pretty much the same things as you have, swim one mile/day as well as walk 4 miles every day, come rain or shine and been doing this for at least 40 years as well as watching what I eat. Unfortunately having problems with my spinal column along with arthritis etc. So more recently I had to curtail my activities, and I never see eighty again. But I am not complaining as I had a great life, just so my genes were not what they could have been, I guess we just have to deal with what we were given at birth. Take care
If you made it past 80, you have done very well. Your mental capabilities seem in very good shape as well. Keep exercising as much as possible. It has more benefits than I ever imagined.