Need to have an account to verify age? No thanks. Google doesn’t get any of my business.
The way around verification of age for such videos is simple. Modify the URL like so:
https://www.youtube.com/watch?v=ax-ykaRU8G0
https://www.youtube.com/v/ax-ykaRU8G0
That is, remove the “watch?”, and replace the equals sign after “v” with a right slash. That’s it. You will get a video that is automatically full screen.
This usually works for “violence” videos, but if they are sexually explicit videos, it may not work. Likewise, if they are not allowed for play in the US.