Babysitting
There is no law saying how old you have to be to babysit. You could do this from age 13, as with other jobs, although looking after children is a big responsibility more suited to older children. It may also cause a problem for the adults who ask you to babysit. You are not 'adult' in the eyes of the law until you are 16. This means that, if anything happens to you or the child you are looking after, the adults responsible for the child are responsible for you too.