I tried to start a forum for older martial artists on another site. I was hoping for people over 50 years old. Few posted. Quite a few under that age posted in a supportive way. I think there just aren't enough of us around.
What I personally have found on the fightingarts site, is that when I am going through an age related martial arts crisis, I can post on karate or conditioning and I get plenty of appropriate postings from older and getting there folks. I'd say that is a good enough compromise with the reality of our numbers.
The older I get, the better I was!