Use it or lose it pal. I’m 42 and don’t know how y’all have sore backs.

Just keep active is all it takes. Not even a lot either, I run 15-20km a week and go rock climbing/bouldering 2-3 times a week. Do some stretches daily and I feel the same as I did at 20.

Edit: Crazy how this is downvoted. Something backed my science. I too was getting achy as I got older that’s why I made the conscious effort to use my muscles rather than let them wither away. Now 6 months of running and 12 months of climbing and I feel amazing most of the time.