My best guess based on my experience is stay as active as possible.
I was declining in health in my 50s, overweight, had diabetes and issues from that.
I had 7 heart attacks in one week; had stents fortunately instead of by-pass surgery and it worked.
I used it as a wake up call to start losing weight; I started walking and eating less.
Now I can barely eat a plate of food without feeling stuffed.
Just not hungry.
I walked up to 8 miles daily and have lost 70 pounds.
Actually down to my high school weight.
I started kayaking at 62 and until the drought drained my local river, I was doing that once or twice a week for 2–4 hours.
So got in much better shape.
I feel much better, no longer take blood pressure meds.
Take several meds of course for my heart but cardiologist says it is in excellent health. I was with my two brothers recently, 3 and 4 years older, and both of them are declining health wise.
One does walk, but he is not keeping his weight off and had 4 bypasses a few years back.
I’m just 63 but I do think I can maintain good health for a long while by keeping active as much as possible.
I have some friends in their 70s who keep very active and look great and are in great health.
I know some in their 50s and 60s who don’t, and it sure shows.