Track And Field For Children Where Can I Go In Southern California For Children's Track And Field Leagues?

Where can I go in southern California for children's track and field leagues? - track and field for children

I noticed that my 7 years old, has a talent for racing. It's fast and like to run away with me. I wonder what kind of league or sports team in Southern California. Or is he too young? I know that some universities have track meets, but asked if I could return sooner. It has the power and the family has been jogging, but I think it's more of a sprinter.