When we see K-pop groups debut for the first time, we often get alarmed by many factors. The crazy talent, the fantastic visuals, and most importantly -- the young age! It is common for K-pop stars to debut in their late teens but no later than their early 20s. 

Today, we're going to take a jab at some groups and explore the average age of the group when they debuted! While we can't take a look at all the groups, we've hand-picked some that might be surprising to see! So without further ado, let's take a look! Please note that these ages are calculated in the Korean Age.

NCT Dream - Average Age 16.7 (2016 Debut)

Mark - 18 / Haechan, Jeno, Jaemin, Renjin - 17 / Chenle - 16 / Jisung - 15

Weeekly - Average Age 18.1 (2020 Debut)

Lee Soo Jin - 20 / Park So-Eun, Monday, Shin Ji-Yoon - 19 / Jihan, Lee Jae-hee - 17 / Zoa - 16

SHINee - Average Age 18.2 (2008 Debut)

Onew - 20 / Jonghyun - 19 / Key, Minho - 18 / Taemin - 16

BTS - Average Age 19.7 (2013 Debut)

Jin - 22 / Suga - 21 / RM, J-Hope - 20 / V, Jimin - 19 / Jungkook - 17

Oh My Girl - Average Age 19.8 (2015 Debut)

Hyojung - 22 / Mimi, Yooa - 21 / Seunghee - 20 / Jiho,  Yubin - 19 / Arin - 17

BLACKPINK - Average Age 20.7 (2016 Debut)

Jisoo - 22 / Jennie - 21 / Rose, Lisa - 20

WINNER - Average Age 22.5 (2014 Debut)

Kim Jin Woo - 24 / Lee Seung Hoon - 23 / Song Mino - 22 / Kang Seung Yoon - 21

Brown Eyed Girls - Average Age 24.5 (2006 Debut)

JeA, Miryo, Narsha - 26 / Gain - 20

Wow - looking at these videos is helping us reminisce about our favorite groups' debut days, and they cannot be any cuter! Yes - some groups' average ages are super low, but groups like Brown Eyed Girls had some late bloomers into the entertainment world. The important thing, however, is that they are still all here, providing us with great music, and they have bloomed and grown musically and visually! What are your thoughts on this list? Were there any groups that surprised you? Let us know in the comments below!