Firstly, this quiz should be updated, since the age of all the members would have changed by now. Also, the age of the members should be following Korean age, since I typed 154, because Jin was 25, Suga was 24, J-hope and Rap monster were 23, Jimin and V were 22 and Kookie was 20 in their Korean age when it was 2016, and I got it wrong. The age should follow their Korean age, the members are Korean after all.
https://bit.ly/2R03bLj