Commissioned by Radio Times.

Illustration for an episode of Crowd Science.

In many countries, 18 is considered the age of maturity: it's often when you're allowed to vote or be responsible for other people. But are we proper adults by then? Does maturity look the same all around the world? And is it really true that young women are more mature than young men? Presenter Caroline Steel digs around for answers with the aid of renowned neuroscientist Sarah-Jayne Blakemore, along with a physiologist and a primatologist.