I am 58 and am fortunate to be in good shape. No issues with back, joints, knees, etc. I really think not being very good in sports that demanded a lot of physicality (football, basketball, etc.) helped me in the long run
. Not getting as many hits or running up and down the court as much as some of my friends who excelled in these sports has left me in better physical condition that some of them. I stopped my "weekend warrior" days of playing contact/flag football in my early 40's and full court basketball against my kids and their friends in my early 50's.
I'm learning that just staying active everyday seems to help delaying things... walking, hiking, biking, gym workouts, yoga. Walking the golf course, or riding the course but keeping the cart on the cart path also helps. Even mowing -I've been delaying fixing/replacing my riding mower from last year because I'm finding what a good workout I'm getting with a push mower). Even now working at home I put together a makeshift standing desk so that I could stand up more than I sit during working hours. And then there is, shall I say, "regular physical intimacy" without need for chemical enhancement that I'm sure is a benefit of keeping in shape.
I have been going for thorough annual checkups every year since I was 40... and I am SURPRISED at how few of my male friends do. These annual checks have uncovered several issues that were able to be addressed and resolved in plenty of time and improved my health. It is incredible how the thought of getting their prostate checked strikes fear into them
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I'm also paying much more attention to food... I used to think DW was crazy for counting calories and weighing food, but..now I'm doing it. Using fitbit helps. I look at it as another "nerdy" way to mess around with numbers. It also helps with tracking my weight, which is down almost 30 pounds from when I "peaked". I don't really diet, but eat more balanced and in moderation. While my days of eating a 16 ounce Skittles bags in a single sitting a couple of times a week are over, I'll still enjoy a 2 ounce bag 1-2 times a month guilt free
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So I'm hoping I can get some good years for a while - though I would agree that 70 seems to be when things start catching to most (not all) folks. My goal is to trying to keep moving and active as much as I can. I'll always remember the grandfather of one of my friends growing up who must have been in his 80s but was still very active. Once he was doing some work in their yard, and we offered to help, and he said, "Thanks, but I'm fine and I like the activity. The day will come when I won't be able to do this anyone, so I want to do it for as long as I can." Wise words.