It depends where you are in the world.
In the UK a lot of people are under the assumption the age is 14 or 16.
Legally, however, there is no minimum age to babysit a child in the UK. The babysitter just has to be of sound mind and capable of looking after someone other than themselves.
(I once had to ask the local Council who referred me to the Police for an answer. That's what they told me.)
It depends on how responsible they/you are. 11 is good a good age
depends on how old the sister is, but 10 should do fine.
from 10 up
I believe it is fourteen. I hoped i helped
19
You have to be at least 12 years of age to babysit in QLD. A parent is not allowed to leave any child alone if they are under the age of 12.
That 13 yar old is too young to babysit.
100
old enough to care for that child
you have to be 11 and up to babysit in Saskatchewan
You have to be 17 or 18 to babysit a child overnight. Sometimes when you babysit someones child you must not have a record with the police.
13
Anywhere from 12+