I'd say about 9, 10, or 11. It depends how responsible you are. I am a mothers helper for 2, 3, 4, and 5 year olds and I am 10.
How Old Do You Have To Be To Be A Mother's Helper?
I think that you should have to be at least 12 to be one. I for one do it as a full time job. Its how I pay my rent