I tore the medial meniscus in my right knee playing volleyball back in my mid 30s. Several months later, had it repaired by arthroscopic surgury, removing the torn part. 3 days later I was doing minimal weight leg extensions, started light squating and o-lifts again a month later.
By the 6 month mark, everything was back to normal--several hours of volleyball a week, heavy squats, snatches, clean and jerks, and deadlifts. I never was that strong however, 160kg squat was my max both pre and post injury, 137.5 pre and 135 post clean and jerk, 120 pre and 115 post snatch, so the stress on the joint was possibly not as much as you might encounter.
I'm now 58, still lifting, started throwing (shot discus, hammer, weight, and highland games stuff) in my 40s. Volleyball is out, but not because of the knee, I moved and never found a suitable group to play with. No knee problems associated with the injury throughout all this. So, depending on the severity of your injury, and just how much you stress the joint, it is quite possible to get back to tolerable levels.