When you sign up for Tumblr, we ask you for your age. We use that information for a couple different reasons.
First of all, if you’re a resident of the European Union, as of May 25, 2018, you must be at least 16 years old (or the lower age that your country has provided for you to consent to the processing of your personal data) in order to use Tumblr. In a number of European countries, legislation to change the minimum age is pending. We are carefully monitoring this legislation in case the minimum age in your country changes. In all other regions, you must be at least 13 years old to use Tumblr. No exceptions.
Additionally, you must be at least 18 years old to turn off Safe Mode. If you’re under the age of 18, Safe Mode is enabled for you and you can’t disable it.
Your age is calculated according to the age you gave during signup. Since we go by your birth year and not your exact birthday, you may need to wait until January 1 of the following calendar year before you can disable Safe Mode. For example, if you said you were 16 when you registered in 2017, you'll have to wait until January 1, 2019. Note that if you registered before your birthday that year, your age will be rounded down in our system.