You probably haven’t wanted to look older in a photo since you got a fake ID when you were a teenager. Now, you’re all about looking younger and here’s the best way to pull it off.

All you have to do is: Smile. That’s it. Just smile.

A new study found that when people smiled in photos, people thought they were an average of two years younger than they actually were. some people looked up to four years younger.

And when people looked sad or angry in pictures, they looked an average of one year OLDER than they really are.

Neutral expressions didn’t add or subtract any years.