JJ, I am again impressed. I tend to keep my races quite far apart. Maybe because I have not yet been running as long as you. (Not yet 2 years). I seem to take long time to recover from a race, although that is getting easier each time.
Re feeling different etc. I feel different to my friends out of the gym situation, and yes you get all the stuff/rubbish you said, "I used to be a cross country runner, etc but like you they follow that with remarks like my knees are bad now etc etc" Well I could easily stop because of my knee, but I just run through it and in fact I think they are better since the running.
But in the gym, I happily chat to a 30 year old pacing away on the treadmill as if he was one of my contempories. Forgetting that I am twice his age!
Just for the record, after 30 odd years of skiing, (a good skier), I had a serious accident some 5 years ago. I had a helicoptor rescue off the mountain side after wrapping myself around a metal post at speed. This resulted in major abdominal surgery, and a couple of broken ribs. I am lucky to be here. The minor injuries were to my left shoulder and knee. I still have restricted movement in my shoulder, but so what. The knee became a problem and I had to give up tennis. Hence the running after a 17 year gap. It just did not like the twisting movements needed for tennis.I feel very proud of myself to be running competitively again. I have to say I have not tried skiing again, I do snow shoe walking instead which is great fun, and hard work too. I have nothing to proove to myself by skiing again.