Member ages
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.
Oldest to youngest
| Rank | Member | Age | Birthday | Position |
|---|---|---|---|---|
| #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 |