bypass youtube age restrictions

step 1. find video that you want to watch but is restricted.
example: http://www.youtube.com/watch?v=7fIdYkb7xW0

step 2. simply change /watch?v= to /v/

if you did everything right url looks like this now: http://www.youtube.com/v/7fIdYkb7xW0

step 2. simply press enter and enjoy your video.