YouTube require users to login to watch age restricted YouTube videos. It’s not secure to use for credentials on a public computers; So here comes the life saver. YouTube NSFW.
YouTube NSFW allows you to bypass YouTube login and watch video when you are using public computer.
How to watch age restricted videos on YouTube on laptop, PC or Mobile?
Whenever YouTube asks you to login to see the YouTube video, simply put NSFW after YouTube in URL bar: