If you think that you've only reached a level of maturity after reaching your 30s, you're not alone and
Brain scientists say that most people don't become 'adults' until their third decade, with your 20s increasingly a time when a lot of us are still mentally growing, reports the BBC.
Although 18 might be the age that adulthood officially begins, people are still undergoing changes in the brain at that time which can affect behaviour and make them more likely to develop mental health disorders.
Scientists say that the age we become adults is different for everyone and that the transition from childhood onwards is a gradual process.
"What we're really saying is that to have a definition of when you move from childhood to adulthood looks increasingly absurd," said Professor Peter Jones, from Cambridge University. "It's a much more nuanced transition that takes place over three decades."
"I guess systems like the education system, the health system and the legal system make it convenient for themselves by having definitions," he added.
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