Member ages
OURBIRTHDAY Member Ages and Birthdays
OURBIRTHDAY member ages and birthdays ranked oldest to youngest, from Kuk Chorok at age 20 to Kilala at age 15.
Oldest to youngest
| Rank | Member | Age | Birthday | Position |
|---|---|---|---|---|
| #1 |  Kuk ChorokMember | 20 | Jul 28, 2005 | Member |
| #2 |  Shin HyewonMember | 20 | Oct 5, 2005 | Member |
| #3 |  Cho HyejinMember | 18 | Oct 24, 2007 | Member |
| #4 |  UMember | 17 | Aug 21, 2008 | Member |
| #5 |  BabyMember | 17 | Feb 10, 2009 | Member |
| #6 |  AchirayaMember | 16 | Aug 18, 2009 | Member |
| #7 |  KilalaMember | 15 | Dec 17, 2010 | Member |