I am 45 and I fell off my bike yesterday and I feel my chest is bruised, my wife wanted me to ask if it could be that I broke a rib?

It is better to seek medical advice since it is more detailed and they can further assess the body especially the chest part just to be sure and if ever there is something serious that happened then it could be treated ASAP. :)

A broken rib really HURTS. If you aren't sure, it isn't. If it's cracked, the treatment is at most an elastic bandage wrapped around your chest, and orders to stay somewhat inactive for a while.