Is Amber the youngest member of f(x)? Fans know the answer to that, and Amber shared why she questioned it for a second.

She posted to Instagram on May 8, "What the hell. Am I 4?" In the photo, Victoria,Krystal, Luna, and Amber of f(x) are rated according to age by a smartphone app. The app guessed that Victoria was 22 (actual age 28), Krystal was 20 (20), Luna was 18 (21), and Amber was 4 (22).

Fans commented, "Everyone came out young, but Amber at 4 years old is shocking," "There's a reason why she's so cute," "Baby Amber. I welcome you to the world of children," "Super Junior's Donghae came out as 5," and more.

Do you think the ages, excluding Amber's, seem accurate?