And chronic stress and anxiety can lead to frown lines and a furrowed brow.
I've got crow's-feet, and my frown lines make me look like I'm permanently studying.
'If you are one of the unfortunate people who frown or squint while they are concentrating at the screen then, over time, you will inevitably end up with frown lines,' Dr Prager, 42, said.
Well, if the muscles that cause those frown lines on your forehead could be prevented from moving, you too, could have skin like Nicole Kidman's.
Clutching her exposed belly, where a small tattoo hints at her racy, child-free past, the expectant fortysomething mother lies on the doctor's couch, frown lines forming.