I used to be able to do it fine on my computer without really needing to do anything, I don’t know why that was, maybe something to do with ublock origin? I didn’t really look in to it because it worked. Then I started having to actually deal with the problem because eventually the browser couldn’t just load the video no issue anymore. I had to either use Newpipe on my phone or yt-dlp to watch locally. Recently neither of those options worked. I also tried invidious or other various proxies hosting youtube videos, they are met with the same age restriction issues.

My final last recourse had been using Shutter Encoder which somehow managed to download age restricted videos that yt-dlp couldn’t which is odd because I was fairly sure it was actually using yt-dlp but now even THAT doesn’t work.