Umur ahli
UDTT Member Ages and Birthdays
UDTT member ages and birthdays ranked oldest to youngest, from Risako at age 29 to Kwon Yejin at age 20.
Paling berusia ke paling muda
| Kedudukan | Ahli | Umur | Hari lahir | Posisi |
|---|---|---|---|---|
| #1 |  RisakoMember | 29 | Jun 7, 1997 | Leader, Vocalist, Dancer |
| #2 |  Han ChaeheeMember | 24 | Nov 13, 2001 | Sub Vocalist |
| #3 |  Koo HannaMember | 22 | Jan 20, 2004 | Main Vocalist, Dancer |
| #4 |  JessicaMember | 21 | Feb 17, 2005 | Member |
| #5 |  Kwon YejinMember | 20 | Jun 26, 2006 | Sub Vocalist, Maknae |