If you are Underage, You Could Invest in Something?

There is no age minimum to invest, make money from those investments, and pay taxes on their profits.

However

There is a minimum age to open an account at a bank or brokerage. You may have to have a parent opens an account for you. But then that would be responsible for taxes. There are some cases where you can make money a year, you lose money the next, and then have a tax bill that you can not afford to pay.