well, I'm 44, 6'4" and currently 285 (coming down from 300 recently - thanks for riding)
I suppose what I ride is quite a bit different from most of your pics...but it's something I enjoy. simple and fun, and I'm told I never have to worry about breaking parts on it - as it was built for jumping. That's a a relief at my size/weight and how I ride.
80% street (weeknights) and 20% trails (weekends)
2004 Specialized P1. I have had the shop added a handlebar riser (3") since this pic and the seat was low because my daughter had ridden it this day: