It is funny, a few years ago my YT account got flagged, for 17+ years it worked fine, but suddenly I could not watch age restricted videos, they wanted my ID to verify my age.

However, most videos I watched was not restricted, so I ignored it, and realized something, I just had to wait a month or two and then my YT account was 18, and I suspected they would lift the block at that time.

And, indeed they did, I never sent in any ID or verified in any other way, and it has worked fine for years since then