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OURBIRTHDAY Member Ages and Birthdays
South Korea · Official roster: 7 (7 birthdays recorded)
OURBIRTHDAY members from oldest to youngest: Kuk Chorok (21), Shin Hyewon (21), Cho Hyejin (19), U (18), Baby (17), Achiraya (17), Kilala (15). The oldest is Kuk Chorok, born July 28, 2005; the youngest is Kilala, born December 17, 2010.
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Exports 7 recorded birthdays on this page, repeating yearly. This file does not update automatically; download and import it again after corrections. Set reminders in your calendar app.
Birthdays of all members
| Birthday | Member | Other spellings |
|---|---|---|
| October 24 | Cho Hyejin 조혜진チョ・ヘジン | — |
| July 28 | Kuk Chorok 국초록クク・チョロク | — |
| October 5 | Shin Hyewon 신혜원シン・ヘウォン | — |
| August 21 | U 유Kawasaki Yu | — |
| February 10 | Baby 謝佳軒베이비ベイビー | Hsieh Jia-Xuan |
| August 18 | Achiraya 아치라야アチラヤ | Achiraya Karwinwit |
| December 17 | Kilala 키라라キララTakashima Kirara | — |
Roster source: Instagram @ourbirthday_official (retrieved October 26, 2026)
Age ranking of members (oldest to youngest)
We have full birth dates for 7 of 7 members (members with only a birth month and day are left out, since their age can’t be calculated). Ages update to today’s date.
| Rank | Member | Birthday | Age |
|---|---|---|---|
| 1 | Kuk Chorok | July 28, 2005 | 21 |
| 2 | Shin Hyewon | October 5, 2005 | 21 |
| 3 | Cho Hyejin | October 24, 2007 | 19 |
| 4 | U | August 21, 2008 | 18 |
| 5 | Baby | February 10, 2009 | 17 |
| 6 | Achiraya | August 18, 2009 | 17 |
| 7 | Kilala | December 17, 2010 | 15 |
Ages here are international ages (counted from the date of birth), the system South Korea has also used officially since June 2023, not “Korean age”.
Age stats
Based on the 7 of 7 people listed here with a full date of birth. People whose birthday is undisclosed or given only as a month and day are left out, and their ages are not estimated.
- Average age: 18.3 years
- Largest age gap: 5 years 4 months (oldest: Kuk Chorok; youngest: Kilala)
- Born the same year: 2005: Kuk Chorok, Shin Hyewon; 2009: Baby, Achiraya
- Chinese zodiac year of birth: Wood Rooster: Kuk Chorok, Shin Hyewon; Fire Pig: Cho Hyejin; Earth Rat: U; Earth Ox: Baby, Achiraya; Metal Tiger: Kilala
Years are counted from Lunar New Year, so people born in January or February before Lunar New Year belong to the previous year’s sign.
OURBIRTHDAY Members’ Zodiac Signs
- ♌ Leo: Kuk Chorok, U, Achiraya
- ♎ Libra: Shin Hyewon
- ♏ Scorpio: Cho Hyejin
- ♐ Sagittarius: Kilala
- ♒ Aquarius: Baby
Only members with a known birthday are included. Sign boundaries: zodiac index
This page lists all 7 members on OURBIRTHDAY’s official roster. 7 of them have their own page on this site (our inclusion rule: someone has held a support event for them, or a verifiable identity or birthday source exists). The rest are marked “roster only” and appear only in this table. Birthdays are listed only when we find a verifiable source; otherwise they’re marked “no verifiable source found.” We never fill gaps with guesses. Spotted an error, or have a verifiable official source? Email service@joelin.cc. (email us a report)
Fan Events
Events posted by fans show up here as soon as they’re published. Whether an event is also featured on the home page is a separate pick by Joe and has nothing to do with this list.
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Group support usually centers on debut anniversaries and concerts. Each member’s birthday is in the table above.
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FAQ
- What are the birthdays of OURBIRTHDAY's members?
- OURBIRTHDAY’s official roster has 7 members. Those with a verifiable birthday on this site: Cho Hyejin October 24, Kuk Chorok July 28, Shin Hyewon October 5, U August 21, Baby February 10, Achiraya August 18, Kilala December 17. Each birthday’s source is cited on this page and on the person’s own page.
- How many OURBIRTHDAY members are listed on this site?
- OURBIRTHDAY: Official roster: 7. Of these, 7 have a verifiable birthday recorded on this site. This page lists all 7 members on OURBIRTHDAY’s official roster. 7 of them have their own page on this site (our inclusion rule: someone has held a support event for them, or a verifiable identity or birthday source exists). The rest are marked “roster only” and appear only in this table. Birthdays are listed only when we find a verifiable source; otherwise they’re marked “no verifiable source found.” We never fill gaps with guesses. Spotted an error, or have a verifiable official source? Email service@joelin.cc.
- What is the age order of OURBIRTHDAY's members? Who is the oldest?
- We have birth years for 7 of 7 OURBIRTHDAY members (members with only a birth month and day can’t be ranked by age). Ordered from oldest to youngest: Kuk Chorok (born July 28, 2005), Shin Hyewon (born October 5, 2005), Cho Hyejin (born October 24, 2007), U (born August 21, 2008), Baby (born February 10, 2009), Achiraya (born August 18, 2009), Kilala (born December 17, 2010). The oldest is Kuk Chorok, and the youngest is Kilala.
- What are the zodiac signs of OURBIRTHDAY’s members?
- Based on their birthdays: Leo: Kuk Chorok, U, Achiraya; Libra: Shin Hyewon; Scorpio: Cho Hyejin; Sagittarius: Kilala; Aquarius: Baby. Signs use the month and day only, with the boundary dates explained on our zodiac pages.