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IDID Member Ages and Birthdays
South Korea · Official roster: 7 (7 birthdays recorded)
IDID members from oldest to youngest: Jang Yonghoon (21), Kim Minjae (21), Park Wonbin (20), Chu Yoochan (20), Park Seonghyeon (19), Baek Junhyuk (18), Jeong Semin (18). The oldest is Jang Yonghoon, born April 20, 2005; the youngest is Jeong Semin, born October 10, 2008.
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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 |
|---|---|---|
| April 20 | Jang Yonghoon 장용훈 | — |
| August 17 | Kim Minjae 김민재 | — |
| April 19 | Park Wonbin 박원빈 | — |
| October 3 | Chu Yoochan 추유찬 | — |
| October 5 | Park Seonghyeon 박성현 | — |
| June 7 | Baek Junhyuk 백준혁 | — |
| October 10 | Jeong Semin 정세민 | — |
Roster source: STARSHIP Entertainment — IDID (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 | Jang Yonghoon | April 20, 2005 | 21 |
| 2 | Kim Minjae | August 17, 2005 | 21 |
| 3 | Park Wonbin | April 19, 2006 | 20 |
| 4 | Chu Yoochan | October 3, 2006 | 20 |
| 5 | Park Seonghyeon | October 5, 2007 | 19 |
| 6 | Baek Junhyuk | June 7, 2008 | 18 |
| 7 | Jeong Semin | October 10, 2008 | 18 |
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: 19.6 years
- Largest age gap: 3 years 5 months (oldest: Jang Yonghoon; youngest: Jeong Semin)
- Born the same year: 2005: Jang Yonghoon, Kim Minjae; 2006: Park Wonbin, Chu Yoochan; 2008: Baek Junhyuk, Jeong Semin
- Chinese zodiac year of birth: Wood Rooster: Jang Yonghoon, Kim Minjae; Fire Dog: Park Wonbin, Chu Yoochan; Fire Pig: Park Seonghyeon; Earth Rat: Baek Junhyuk, Jeong Semin
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.
IDID Members’ Zodiac Signs
- ♈ Aries: Park Wonbin
- ♉ Taurus: Jang Yonghoon
- ♊ Gemini: Baek Junhyuk
- ♌ Leo: Kim Minjae
- ♎ Libra: Chu Yoochan, Park Seonghyeon, Jeong Semin
Only members with a known birthday are included. Sign boundaries: zodiac index
This page lists all 7 members on IDID’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 IDID's members?
- IDID’s official roster has 7 members. Those with a verifiable birthday on this site: Jang Yonghoon April 20, Kim Minjae August 17, Park Wonbin April 19, Chu Yoochan October 3, Park Seonghyeon October 5, Baek Junhyuk June 7, Jeong Semin October 10. Each birthday’s source is cited on this page and on the person’s own page.
- How many IDID members are listed on this site?
- IDID: Official roster: 7. Of these, 7 have a verifiable birthday recorded on this site. This page lists all 7 members on IDID’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 IDID's members? Who is the oldest?
- We have birth years for 7 of 7 IDID members (members with only a birth month and day can’t be ranked by age). Ordered from oldest to youngest: Jang Yonghoon (born April 20, 2005), Kim Minjae (born August 17, 2005), Park Wonbin (born April 19, 2006), Chu Yoochan (born October 3, 2006), Park Seonghyeon (born October 5, 2007), Baek Junhyuk (born June 7, 2008), Jeong Semin (born October 10, 2008). The oldest is Jang Yonghoon, and the youngest is Jeong Semin.
- What are the zodiac signs of IDID’s members?
- Based on their birthdays: Aries: Park Wonbin; Taurus: Jang Yonghoon; Gemini: Baek Junhyuk; Leo: Kim Minjae; Libra: Chu Yoochan, Park Seonghyeon, Jeong Semin. Signs use the month and day only, with the boundary dates explained on our zodiac pages.