I will be 36 this Monday. Still a young buck. But I have witnessed many people younger then me miss months of work due to bad backs, knees, shoulders, etc. You would think I work in a factory as many people are out on disability. As I type this today I have zero back pain, knee pain, shoulder pain, or the like.
I once went to a chiropractor that worked on Muhammad Ali in his prime. He had all kinds of contraptions and at the time I was preparing for my last powerlifting meet, IPA Worlds, so I was looking for any legal edge I could get. He was working on my spine and commented on how the muscles that run up my spine are so thick that he could not physically feel my spine. He said as long as I continued to workout, I would be fine. If I stopped, I was going to stiffen up like a mummy. Fast forward to last year when I had a doctor imposed year off. Instead of stiffing up, I did intense bouts of yoga to keep myself in some sort of shape. Back still felt great.
At 36 I can still do this for reps:
This is a 260 pound concrete ball that I lift from the ground to as high as I can get it. Zero back issues.
If anyone has noticed, I have not spoken once about longevity, health, etc. You can workout and eat right your entire life and you might gain 3-4 years onto your life span. Maybe. Or you could get hit by a bus tomorrow. Personally, I like being able to lift my heavy ground safe out of the back of a U-Haul and walk it all the way around the back of my house and through the back door. The dolly never got any use. I also like being able to hold my own when the situation calls for it, or a huge log on my shoulder out of the woods and into the yard to cut it up, or flip a 1100 pound tire just for the fun of it.
We all have our quirks I guess. One thing is for sure, life is a lot easier when you can lift pretty much everything you need to, run a few miles without breaking much of a sweat, and carry heavy stuff. Remember, when the sh*t hits the fan, the weak are going to get eaten.