My mom lived to be 94. I also have no interest in that existence. 80 will probably be sufficient.
When my body is worn out enough to preclude living independently, it’s time.
A lot of that later years “decrepitude” is allowing long standing habits and dietary trends to continue. You’ve got to keep pushing hard against the aches and the desire to eat like you did when you were 20, 40, etc... and get up each day and push yourself.
My dad had his .300 RUM accurized with a new process a little while back. While it shot crazy groups, it added a lot of weight and his comment was “it’s worthless now, I’m not humping that thing all over the Rockies hunting elk at my age (73 at time) so I got a .300 WIN mag...”. The note there being “humping a rifle in mountains at my age”.
I shoot with a lot of guys that are on the downhill side of the aging process and it’s a shame to see people, friends no less, that could easily look and feel 20 or 30 years younger if they could change some habits that they consider irrevocable at this point. I’m a believer, I merely dropped eating shitty foods (anything with added sugar, simple carbs etc) and it was a sea change.
The #1 thing a “modern” blood sugar load facilitates is inflammation and inflammation is the root for the vast majority of ailments of the older years. You decrease your inflammation state and the next thing you know you start wanting to do more, you do more and your attitude improves. It’s a positive feedback loop. While a certain small percentage of people will have underlying genetic problems that might not be amenable to this I believe the vast majority are subject to these improvements.
My mom is 100 and does real well, but she has a good attitude. I am not blessed with a sunny disposition so I generally want to live only ten years longer. I distinctly remember wanting to live to only 33. But that keeps being pushed out. Now at 62 I want to live to be no older than 75, but I have some projects that will take longer than that. So it will get pushed out, God willing. And my wife takes metformin.