Most adults seem to agree that the older you get, the quicker time flies by. This feeling might, on its surface, seem like one of life’s more enigmatic qualities. But according to the US neuroscientist David Eagleman, there’s actually a pretty straightforward scientific explanation for this phenomenon: habitual situations require much less of our attention than novel ones and, as we age, we become much more likely to be fixed in our routines, and much less likely to encounter anything out of the ordinary. So, as Eagleman suggests in this animation from BBC Ideas, if you want to pump the brakes on your experience of time, try pursuing new experiences – large and small.