You didn't state your goals. Also it might be helpful to know what skill level you are at if you are wanting to compete. Private lessons are a lot of money and are mostly used by competitive gymnasts that are really struggling on a certain skill. That is up to you, but why not check and see if there is a class you could join, you might get more out of it. As far as if it is too late or any point in it, gymnastics is a physical activity, it teaches strenght, flexibility, control, how to manage fears, really the list goes on. So if you want to have learning those things as goals it is never too late. It may be pointless if you are like 65 and looking to compete in the next Olympics.