Laws in most countries require the age of 18 for signing contracts or anything legally binding.
I disagree, many children have a unique view into problems that adults may be unaware of. Since they don't have to make back living expenses, they have a prime opportunity to make a start up.
Most children don’t and most children need to be protected until adulthood when they have a better idea about the consequences of their decisions. Tragedy of the commons again.
We shouldn't let the majority hold back the high performers.