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.
According to who?
Laws in most countries require the age of 18 for signing contracts or anything legally binding.