For a variety of reasons: no boss nobody telling you what to do able to take time off from work when you want However, being self employed is not the "free ride" that it may seem ... it takes lots...
Legal age to contract is 18.
If that occupation is licensed in your state, and it is in most(all?) states, it would be up to the state licensing agency.
Are you kidding? I was self employed at age 14, mowing lawns.
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