I'm not much help with the injury, except to say, make sure you are well healed, do all your PT, etc. etc. before you push your training. It's easy to come back to fast and make things worse.
My coach didn't start riding until she was in her early 40s, she raced masters catagory races all over, and even held a national record for a little while. She attributes her success to very scientific training (along the lines of the cyclists training bible). Even "out of shape" she can outride many of the men around here. So no, it's not to late!