STAYC
South Korea · Official roster: 6 (6 birthdays recorded)
STAYC members from oldest to youngest: SUMIN (25), SIEUN (25), ISA (24), SEEUN (23), YOON (22), J (21). The oldest is SUMIN, born March 13, 2001; the youngest is J, born December 9, 2004.
Birthdays of all members
| Birthday | Member | Other spellings |
|---|---|---|
| March 13 | SUMIN 裵秀珉배수민スミンBae Sumin | 秀珉, 裴秀珉 |
| August 1 | SIEUN 朴蒔恩박시은シウンPark Sieun | 蒔恩 |
| January 23 | ISA 李彩煐아이사アイサLee Chaeyoung | 李采映, 璦莎, 이채영 |
| June 14 | SEEUN 尹勢銀윤세은セウンYoon Seeun | 勢銀 |
| April 14 | YOON 沈姿潤심자윤ユンSim Jayun | 潤 |
| December 9 | J 張叡恩재이장예은ジェイJang Yeeun | 婕怡 |
Roster source: Chinese Wikipedia: STAYC — member list (official site inaccessible; encyclopedia used to corroborate current members) (retrieved 2026-09-25)
Age ranking of members (oldest to youngest)
We have full birth dates for 6 of 6 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 | SUMIN | March 13, 2001 | 25 |
| 2 | SIEUN | August 1, 2001 | 25 |
| 3 | ISA | January 23, 2002 | 24 |
| 4 | SEEUN | June 14, 2003 | 23 |
| 5 | YOON | April 14, 2004 | 22 |
| 6 | J | December 9, 2004 | 21 |
STAYC Members’ Zodiac Signs
Only members with a known birthday are included. Sign boundaries: zodiac index
This page lists all 6 members on STAYC’s official roster. 6 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)
Want to hold a support event for STAYC?
Group support usually centers on debut anniversaries and concerts. Each member’s birthday is in the table above.
FAQ
- What are the birthdays of STAYC's members?
- STAYC’s official roster has 6 members. Those with a verifiable birthday on this site: SUMIN March 13, SIEUN August 1, ISA January 23, SEEUN June 14, YOON April 14, J December 9. Each birthday’s source is cited on this page and on the person’s own page.
- How many STAYC members are listed on this site?
- STAYC: Official roster: 6. Of these, 6 have a verifiable birthday recorded on this site. This page lists all 6 members on STAYC’s official roster. 6 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 STAYC's members? Who is the oldest?
- We have birth years for 6 of 6 STAYC members (members with only a birth month and day can’t be ranked by age). Ordered from oldest to youngest: SUMIN (born March 13, 2001), SIEUN (born August 1, 2001), ISA (born January 23, 2002), SEEUN (born June 14, 2003), YOON (born April 14, 2004), J (born December 9, 2004). The oldest is SUMIN, and the youngest is J.
- What are the zodiac signs of STAYC’s members?
- Based on their birthdays: Aries: YOON; Gemini: SEEUN; Leo: SIEUN; Sagittarius: J; Aquarius: ISA; Pisces: SUMIN. Signs use the month and day only, with the boundary dates explained on our zodiac pages.
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