I'm 70. Still work every day at a 35 year old's job. Don't know how much longer, though. Was quite a cyclist in my younger days. I STILL try to ride a bit every weekend, maybe 12 or 15 miles. Still enjoy being out there in the sunshine with the breeze, shifting gears depending on conditions, talking to people along the way. I like vintage bikes, by my inherent laziness usually makes me choose this ride:
An 8 speed rear hub, hydraulic brakes and belt drive.
I call it "Green Beenie". LOL.