Girls' Generation's Tiffany already has a youthful face but how young is her skin?

In the June 12 episode of Mnet's 'Heart Attack' (also 'Heart-a-tag'), MC Tiffany tried out a new product called 'Skin Wearable'. How it works is that you place the application on your skin such as on your cheek, and it will test for the age of your skin.

Tiffany's 'skin age' was revealed to be 24 years old, which is three years younger than her actual age! (Tiffany's Korean age is 27 while internationally, she's 25 as she hasn't had her birthday yet)! 

When she found out her 'skin age' she showed her trademark eye smile, clearlyhappy with the results. The tests results revealed that Tiffany's skin had a lot of moisture and is in a healthy state. 

Lee Chul Woo also tested his skin using 'Skin Wearable' and although he is 24 years old, his 'skin age' was revealed to be 28, causing laughs on set.

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That's an interesting new product, but we don't need technology to tell us that not only Tiffany, but all of Girls' Generation have great skin!