Once users are signed in to Google+, after clicking on "Profile" then "About" under their profile pictures, they can click on "Edit" under the Basic Information section and change their birth dates. Due to the fact that YouTube is owned by Google, users must change their personal information in their Google accounts, which will carry over to their YouTube accounts.
YouTube is a website that plays videos and some movies online for free. Over 1 billion users visit the site each month. To change personal information on YouTube, users must change their information within their Google+ accounts. Once a user's age is fixed or updated, if he meets the age requirement, the user can view age-restricted material when signed in to YouTube.