Welcome. You'll fit in just fine here. I'm a youngster here at 51, but my lower back is about 90.
Bikes? Glad you asked! My daily commuter is a modified '70's Schwinn Continental - it's now a 3-speed with northroads bars. My randonneuring bike is a RANS V-Rex recumbent.
Other bikes include a Specialized Hardrock, a Santana Arriva tandem, a '60's Schwinn Typhoon 2-speed kickback, a Trek 560 road bike, and a couple frankenbikes. My Sun flat-top unicycle is not technically a bike, but it has pedals and a wheel, and hangs around with my bikes. I think there's one or two more out there but I'm a but too lazy to go check right now.
Important things to remember are pie and N+1.