I tore my ACL in my left knee...
During lockdown, I was doing exercises in the local park, including shuttle-sprints. I had to stop as both knees were hurting. It got bad enough that I had to use sticks for a few months. I had them assessed and it seems both the tendons in both knees are still there, but both stretched, allowing the knee to "wobble" a bit too much in the joint, which is what was causing the pain. No doubt caused by years of playing football as a left-back and putting in tackles on guys much bigger that me - I was tall but a skinny lad. All good now as I have spent a lot of time building the muscles in my legs to compensate.
Never torn a ligament. However they have become stretched in my shoulder after dislocating it 5 times.
My manager a few years back was a rugby player, and he had the same. He regularly popped his shoulder out and had to pop it back in, sometimes doing fairly innocuous things at work. I know he was lined up for an op, but i left before he had it so no idea how it went.
I used to play in goal and recall playing on after I broke a finger in the warm up. Wrapped some tape round it and on we go and never thought much of it
I was goalkeeper for our school team (Hewitt). In one match, I dived for the ball (I'm told I saved it) and head-butted the post, knocking myself clean out. They just leaned me against the post and played on of course - it was around 1980 after all. As I was starting to wake up, someone took a shot which hit me on the head, smacking my head against the post again, and that was it for me for the rest of the match

The PE teacher (Mr Wren) carried me back to the changing rooms after the match and put me in the shower to wake me up, then I was sent to walk the 4 miles home
I will be 40 here in a couple of weeks and though wouldn't say am dreading it persay, not going to exactly celebrate it either. At this point in my life I have accomplished some things that I wanted too but also a lot I have not!
40 is nothing. I'm 59 and I still go to the gym 3 to 5 times a week, still run, cycle, paddle-board. I take it a bit easier now, but last night I ran 8k in 45 minutes on a running machine. I have no plans to give it up for a while yet! In fact I'm looking for a local veterans football team - though I'm not sure my knees would appreciate it!