Member ages
OnlyOneOf Member Ages and Birthdays
OnlyOneOf member ages and birthdays ranked oldest to youngest, from KB at age 34 to Nine at age 26.
Oldest to youngest
| Rank | Member | Age | Birthday | Position |
|---|---|---|---|---|
| #1 |  KBMember | 34 | Apr 23, 1992 | Producer, Lead Vocalist |
| #2 |  LoveFormer member | 32 | Jan 17, 1994 | Leader, Main Vocalist |
| #3 |  RieOn hiatus | 29 | Nov 6, 1996 | Main Dancer, Lead Vocalist |
| #4 |  YooJungMember | 29 | May 29, 1997 | Main Dancer, Lead Vocalist |
| #5 |  JunJiOn hiatus | 28 | Apr 6, 1998 | Member |
| #6 |  MillMember | 27 | Mar 30, 1999 | Dancer, Main Rapper |
| #7 |  NineMember | 26 | Dec 13, 1999 | Maknae, Composer, Leader, Lead Vocalist |