Do you have to pay to subscribe to a youtube channel?

If you want to subscribe to somebody's channel, you have to have an account on YouTube. If you already have an account you can just click subscribe. But yes, it is free when you have an account. It never costs anything even if you don't have an account as well. So if you want to subscribe, you have to have an account. But it comes with a limeted age thingy. So that means you have to be probably 16+.