Chris Pratt may be facing down some prehistoric creatures in "Jurassic World," but he's not the only one ... Hollywood's been overrun with faces from a time long forgotten too!

Try your hand at guessing the age of some of Tinseltown's oldest stars -- and don't worry about getting too close ... we hear most of these fossils have gone dormant.

15. Hugh Hefner

14. Bob Barker

13. Dick Van Dyke

12. Ann-Margret

11. Carol Channing

10. Mel Brooks

9. Angela Lansbury

8. Morgan Freeman

7. Barbara Walters

6. Woody Allen

5. Cloris Leachman

4. Cicely Tyson

3. Sidney Poitier

2. Kirk Douglas

1. Betty White