Member ages
iONE! Member Ages and Birthdays
iONE! member ages and birthdays ranked oldest to youngest, from Aeris at age 25 to Ido at age 20.
Oldest to youngest
| Rank | Member | Age | Birthday | Position |
|---|---|---|---|---|
| #1 |  AerisMember | 25 | Aug 31, 2001 | Main Dancer, Main Rapper |
| #2 |  QaruMember | 23 | May 19, 2003 | Leader, Main Rapper |
| #3 |  NarinMember | 22 | Dec 12, 2003 | Center, Sub Vocalist |
| #4 |  KayaMember | 22 | Feb 19, 2004 | Lead Vocalist, Sub Rapper |
| #5 |  RunaMember | 21 | Nov 17, 2004 | Main Vocalist |
| #6 |  SyreneMember | 20 | Sep 19, 2006 | Face Of The Group, Lead Dancer, Lead Rapper, Leader |
| #7 |  IdoMember | 20 | Sep 21, 2006 | Maknae, Sub Vocalist, Visual |