Taxes on Twitch Earnings?

Hi, from what age can you legally turn on Twitch donations, and do you have to pay taxes?

As a private person, you can't accept donations.
Only clubs can do that. As soon as you operate Twitch with the intention of making a profit, you need a trade and if you are above the tax allowance, you have to pay taxes. Your parents are responsible for everything else.

Twitch itself is aged 13 and over. For everything else in DE from 18 years on in terms of trade and taxes.