1 1 year-old began to learn tennis, is it late?
That depends on what your requirements are. It's too early to play now, but it's generally not too late for a career, but it's basically hopeless to make great achievements (such as 10 before joining the WTO), because most of the world's top players start practicing at the age of 3 or 4, which is an important stage of children's nerve development. Years of practice have made their myelin sheath better than the average person. Moreover, the sense of the ball developed since childhood is not acquired in the future. So if you want to play a career in China, fine, but if you want to be famous in the world, unless you have talent, you really have no chance.