How old do you have to be to be a babysitter and why?

It depends on your trust level. Do they trust you? If you are 11, you can take a red cross babysitting class where I live. If you are younger than that, I suggest you be a mother's helper. A mother's helper is a person who takes care of the children, let's say, when the mother or father is gardening or mowing the lawn. I hope this answer helps.