I believe this is a recent change..I was just browsing some videos on youtube using the same account I've been using for years (with no issues) and I went to watch a cannabis-related video that needed 'age verification'..
Now usually, being signed in is enough, but not any more!
Google now wants us to either ;
Use a credit card to verify immediately (no charge).
or
Use our ID, like a passport or driver's license.
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