There is no maximum age that you can fly. You can be 110 years old and travel by plane. As long as you are healthy, you can always board that plane and travel to another destination. Flying depends mostly on how healthy the passenger is. Most of the time, people with contagious skin diseases are those that may not board the plane. The same is true for people who face the risk of flying at a certain altitude. But generally, there is no age limit when it comes to people who can fly. Unless, of course, you have serious medical conditions. If you have these, then the airline may require clearance from your doc.