At what age do I subscribe to Twitch?

I would like to know how many years old you can subscribe to a streamer on Twitch for a fee. There's nothing about this in the Twitch guidelines. The only thing I found is that the Twitch services are allowed from 13 years of age under the supervision of a parent or guardian. Is the subscription to Streamer included?

Is the subscription to Streamer included? +

No. Strictly speaking.
Because in order to give someone a sub, you have to fall back on services, all of which are usually only from the age of 18. Amazon e.g. Or PayPal.