I am 65. 20 years ago I am pretty sure I had declining cognitive functions. At the time I was a good research engineer, but actually I was morbidly obese, was

I am 65. 20 years ago I am pretty sure I had declining cognitive functions. At the time I was a good research engineer, but actually I was morbidly obese, was unable to walk 2km (~1.2 miles). Yet now I think I am better. What changed? I retired, move to an home in a nice rural setting and tried to improve my health through exercise and loosing weight. I was not easy but I am now able to walk 20km (13 miles) (I even did a 33km round trip). I didn't regain ability to run more than one hundred yards though. Another thing is try to improve your cardiovascular health, a stroke is something devastating. Good luck!