Help for a magazine article on horses for my little sister:

1) One famous horse back rider, that is a girl and is still alive and competing.
2) Name of a white horse with a white mane and white tail.
3) How old should you be to start horseback riding?
4) 3 horse fun facts
5) how to practice horseback riding without a horse

IF YOU ANSWER ALL 5 ILL GIVE YOU BRAINLIEST- THANK YOU! :)