Sadly, I'm not in this group (literally half your age, and would probably die immediately if put on the front line) but I'm certain that there is quite a large number of, shall we say, elder bronies. Hey, everybody loves ponies! It's just a matter of time before you find at least one around.
The fact that MLP helps with your PTSD is quite interesting. I've never heard of something like this before, and I think that it's quite inspirational. Pony on!