Watch age restricted videos on YouTube without signing in
You can also open restricted YouTube videos without logging into the website. All you need to do is to alter the URL a little.
For example, in the restricted video :
'https://www.youtube.com/watch?v=wyOz1Xb4u54&list=PL596583248B91B9C9&index=14', you need to remove '/watch?v=' part and replace with '/v/'.
This will turn the URl to :
'https://www.youtube.com/v/wyOz1Xb4u54&list=PL596583248B91B9C9&index=14' and open the video without logging in.