Hello Doctor, I am 68. I used to be a very high level volleyball player, in senior tournaments all over the country. 3 years ago, I tore the quadricept muscle off of my kneecap. I had it repaired, can now walk normally. Am I too old to consider playing volleyball again possibly re-injuring this knee, or maybe doing it to the other knee? Should I consider myself lucky, and just focus on walking? Thank you. Ron