When I attended the large games in Alberta a couple of years ago, being in my late 30's meant I was middle of the age bracket ranging closer to the younger side. Lots of guys older than me, some of them into their 50's.
I would say that anyone who is really serious about milsim and the associated time/money/equipment is likely going to be married, with lots of disposable income and the ability to take time off (secure job or self-employed).
There are variants on both sides, but that was what I saw.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.