To view age-restricted videos on YouTube, you must be signed into your Google account and have indicated on your profile that you are of legal age to view mature content. You can remove age restrictions for YouTube videos by updating your date of birth in your Google Plus profile.
Parental control guide: How to restrict kids' YouTube Jan 04, 2018 How to Set Parental Controls on YouTube - RealPlayer and Feb 18, 2015 How to Enable Age Restriction on Your YouTube Video Nov 16, 2014
How to turn off Restricted Mode on YouTube - Business Insider
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