yeah, nailed it, they often talk about how they used to ride roadbikes or singlespeeds but now their backs don't really agree anymore and how glad they are that young people are still wrenching on bikes. YMMV as to whether that's just joy or goes to "you're one of the good ones"

converted my one year old surly karate monkey to singlespeed one month ago, completely in love with the simplicity and the simple fact that at some paths/parts I can't simply go faster

using it for all mountain surfaces but downhill and also for commute, I'll not come back to gears

you can guess the age :)