There is no set "legal age" for babysitting in the state of Florida. The suggestion by the Florida Department Of Children and Families is that no child under the age of 12 is to be left without adult supervision.
The Florida Department of Children and Families recognizes that all children mature at different rates and that some may be ready to be left home alone or in charge of their younger siblings before others. Its website has a list of guidelines for deciding when a child is old enough to be left home alone. However, its recommendation is that no child under the age of 12 should be left without adult supervision. The list refers to the responsibility level of the child in question and his maturity. It also details precautions one should take before leaving a child home alone, such as providing emergency phone numbers and a set of safety rules to follow.