Time sure does fly, doesn’t it?

Do you ever see a photo of yourself from 5, 10, even 15 years ago and think to yourself, “where did the time go?”

Well, celebrities surely feel that way, too. And now they have a little help from a guy named Ard Gelinck, who Photoshops famous folks side-by-side with recent photos and old pictures from the past.

These are pretty fun, take a look.

1. Keanu Reeves

2. Reese Witherspoon

3. Haley Joel Osment

4. Dwayne “The Rock” Johnson

5. George Clooney

6. Luke Perry

7. Brad Pitt

8. Will Smith

9. Anthony Hopkins

10. Leonardo DiCaprio

11. Clint Eastwood

12. Jeff Bridges

13. Lady Gaga

Be sure to follow Gelinck on Instagram so you can keep track of these cool mash-ups!

Which ones did you think were the best? Let us know in the comments!