I'm an old guy 60+ just getting back into riding again after nearly a 20 year hiatus. Until my mid-40's I road regularly, commuted by bike, and ran to work out and road race. A commuting accident ended my cycling days when I dropped the bike in a side slide on some road grit, crunched a disc in my back, and lost feeling in my right leg for several weeks. Physical Therapist suggested swimming after several weeks of therapy, and after that a change in career didn't allow for bike again. Now retired, and once again following up after physical therapy following an auto accident, this time the PT suggested that riding a road bike would help flexibility. Joined up because of the Over 50 Forum. Riding a Felt 80 'cause it was my size (60cm), and a great buy - a leftover in a BMX shop, with a full Shimano 105 setup.
The tips and advice in the Over 50 Forum are good stuff.