@alandavis51 I see the comparison of Weightlifters to Crossfitters. This can only exist if we are talking about competitive crossfitters. The programming for a competitive crossfitter is not the same as crossfit for longevity and wellness. I think the competitive athletes understand that their bodies are taking a beating and will probably pay for it in some degree in later years. I'm very interested in seeing how these individuals hold up to time, especially compared to powerlifters and other athletes. I think the issue will be more about the skeletal system, but the heart and brain will remain really healthy, whereas some top end strength athletes are really prone to heart issues because they do very little cardio. There's also the fact that many powerlifters are on steroids, which could be a benefit to aging. Louie Simmons is in his 70's, he's super beat up, but he's mentally sharp as hell. He's also on steroids still, so take that how you will.
If we are doing CrossFit for longevity, I think it's the best thing you can do, with one catch. We need to do more aerobic conditioning. Our programming is going to add muscle mass, which is great for longevity. It adds more neural synapses, which I believe will help keep the mind young. It teaches proper functional movement patterns, like standing from a seated position, picking things up, and getting up off the ground, which reduces the likelihood of common injuries we see in the elderly. In consideration of intensity, form should always come first, and it's relative intensity, which helps us learn to move under duress.
What I think would be found in someone doing CrossFit for longevity for 20+ years and into their 70's and 80's is that they're more able to move from position to position. This is completely speculation, but I would compare, to a degree, being sore and halfway through a workout to the deteriorating mind and body associated with aging. We would also see an individual more mentally tough than someone who hasn't done CrossFit, which I think would help the person stay mentally healthy and with a purpose while aging.