I just turned 39 last month. Ligaments definitely rip instead of stretch like they did when I was a younger man. in 4 years of jiu-jitsu, I've sprained my elbows multiple times, both MCL's, ankle, neck, and toes. Wrestling in my teens & 20's, I had a few injuries but not as many... thinking back, over my 8 years of wrestling all I ever had was turf toes (still dealing with these), one popped elbow, and bursa sac in my knee....that's about it. My popped elbow is the only injury that ever caused me to miss a single practice.
The bigger differences are warm-up and sleep. I used to be able to go from 0 to fully warmed up pretty quickly. now, I seem to creak as I walk, things are sore and stiff, but once I'm warmed up, everything is fine and I feel young again. I don't remember needing such a warm-up before.
As far as sleep - when I was a younger man I could function just fine with 5 hours of sleep. Now, if I don't get 7 hours or more, I'm a mess.
The bigger differences are warm-up and sleep. I used to be able to go from 0 to fully warmed up pretty quickly. now, I seem to creak as I walk, things are sore and stiff, but once I'm warmed up, everything is fine and I feel young again. I don't remember needing such a warm-up before.
As far as sleep - when I was a younger man I could function just fine with 5 hours of sleep. Now, if I don't get 7 hours or more, I'm a mess.