At 53, I've rediscovered my bike! I rode tons in the 80's. Now my wife has inspired me to ride again. I'm at 160 pounds from 190. My 1987 Cannondale Black Lightning (with downtude shifters no less) still rocks.
I'm commuting 16 miles a day in the dark thanks to a gift Night Sun. I've discovered the clothes have improved in the last 20 years to the point that I'm really comfortable at 33 degrees!
Goal: 150 pounds (me, not the bike) and 2000 miles. When I reach my goal I'm going to buy a new bike.