Is it late for people to learn photography in middle age? Is there any future for development?

It is not too late. I am a photographer. I don't think there is an age limit for photography. The most important thing to learn photography is the sense of picture, the sense of picture of children. Everyone's understanding is different, so I personally think there is no age limit. As long as you love photography and regard it as a part of your life, you will certainly succeed!