A babysitter will provide occasional care for your children - perhaps an afternoon here and there, or in the evening, so that you can have a night out. Choosing a babysitter is just as important as choosing any kind of childcare and you have to be as rigorous in your vetting. They will be left in sole charge of your children and, even if it is only for an hour or so, you have to be utterly sure of their competence.
The NSPCC recommend that a babysitter should be older than 16.
Anyone younger than 16 cannot be charged with neglect or ill treatment of children in their care. If you leave your children with someone under 16 you are still responsible for them. If something goes wrong and you are found to have left your children with an unsuitable babysitter, for example, one who cannot communicate adequately to cope with an emergency or one who is under age, you could be charged with neglect.