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 / Updated  / Source: TODAY
By Erin Clements

You're only as old as you feel, the saying goes — but a new Microsoft website that uses facial-recognition technology to assess people's ages has become a viral sensation for using other measurements.

TODAY's anchors had some fun uploading their own photos to the site Friday morning, which made us wonder how various celebrities would fare using the popular new tool.

Pharrell Williams and Jared Leto — both in their 40s — are known for their youthful looks, but could they fool We uploaded images of five fresh-faced celebs to test it out; here are the results.

Pharrell Williams


Giving the 42-year-old singer another reason to be "Happy," the website deemed him 29.

Jennifer Aniston


The site was spot-on for Aniston, guessing the exact age of the 46-year-old "Friends" actress.

Paul Rudd


The "Ant-Man" actor was guessed to be 44, two years below his actual age.

Lori Loughlin


The 50-year-old "Full House" actress hasn't changed since her "Aunt Becky" days, and the site agreed, guessing that she was 39.

Jared Leto


To us, 43-year-old Jared Leto will always be teen heartthrob Jordan Catalano on "My So-Called Life," but the site came close to his real age, guessing 42.

Visit to see the site guess your own age!