Sport bikes childish? Definitely. I think riding motorcycles helps keep me young and in shape. I'll be 55 this month and riding has been my sport since 1971. Friends my age that don't have bikes are much more "mature" than me. If they do any sport at all, it's golf or bowling. Sports you can do with a beer. And cruiser riders my age seem to always have their bikes parked in front of bars. Dangerous? Yes, but isn't anything that is thrilling also dangerous?
I don't have any friends who ride, so I too come to TWF for the camaraderie. Luckily, my wife supports my sport of riding, but I try and balance riding and family. I'll probably have to hang up my leathers some day too, but I hope it doesn't come for a long time. Good luck in your next endeavor.