As you enter your 40s, lines begin to appear around your upper lip, and if you smoke, they’ll come faster and go deeper.
This is called the ‘purse string’ muscle, and because this area is prominent, it’s more at risk for sun damage – so if you skipped out on sunscreen in earlier years, you’ll see the results here first.

Be prepared to see more wrinkles in your forehead and crow’s feet around your eyes plus a deepening of the smile lines.