I think we should look at the physical condition of the individual, not the age. Many people abroad attach great importance to fitness and jog every week, so many people are not old when they are old. If you think you are fit to play ball, it's no problem to try. Life is just trying! How do you know if you can do something before you try? It's good to be interested. At the age of 40, your life is still very long ~ cultivating different hobbies is helpful to people's physical and mental development! Don't continue if you feel a little wrong.