Whats the best age for a cat to have kittens?

Anytime I guess, when ever you desire! You must have some money to afford the shots and the health care. If you don't have money to go to the vet don't get a kitten!! :( Be aware for scratched up furniture and litter box training! Some kittens don't learn! To get the right supplies for your cat is to go to Petco, Pet smart or other places.