I disagree with the others about there being no age too old. As people get older, their sense of balance goes first. Balancing is a critical part of riding a bike. As long as a person has a good sense of balance, I would think that riding a bike would be OK. But it is something to think about first. My 85 year old mother was thinking of riding again and my brother advised her not to for just this reason. She asked me and I told her that my brother is quite right that the sense of balance goes first and it might be more prudent to walk instead.