'People don't become adults until their 30s'
Have you ever been told to "grow up" in your 20s or need an excuse as to why you still find cat videos on the internet really funny? Well now you might have an official reason as to why you're not acting like a mature adult. People don't become fully "adult" until they're in their 30s, according to brain scientists. Currently the UK law says you become a mature adult when you reach the age of 18.