Regardless of browser, every video from youtube is age restricted but only for me

This makes no sense because other devices in my house on the exact same connection are able to use it without issue. I’ve tried logging out, different browsers, the only thing that works is to use an entirely different computer. How the abject f**k does this even happen?

Age restriction is most likely not the issue here. Are you using a VPN on the computer that has the issue? If yes, try to disable it and let me know if that helps.

I am not. I have also removed all browser addons

That’s strange. Any security software installed on the device?