Comment by Fricken

Now that I'm in my 50s my tendons have lost a great deal of elasticity, maintaining muscle mass is starting to feel like a losing battle, but my knee joints are great, and that's in spite of a lifetime spent ignoring all popular advice on how not to wreck them.

Of course, You don't have to look far to see pro-athletes or ex-pro athletes: runners, tennis players, basketball players and gymnasts who have been going hard on their knees for decades and are still physically impressive relative to any of us mortals.

If you've torn or damaged your meniscus at some point you are statistically prone to osteoarthritis later in life but otherwise you should be fine.

https://msklab.med.ubc.ca/how-to-save-your-knees-without-giv...