You have two ages, chronological and biological

Reminiscent of a scene from "The Social Network," the whiteboard in researcher and professor Morgan Levine's Yale Medical School office is covered in a series of letters and numbers. She clicks the red cap back onto the dry erase marker and steps back to admire her work.

Beautiful stars for every age

Check out a beautiful star for nearly every age starting at 21 years old and going up, including Glenn Close, who celebrates her 72nd birthday on Tuesday.