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ONF Member Ages and Birthdays
South Korea · Official roster: 6 (6 birthdays recorded)
ONF members from oldest to youngest: HYOJIN (32), E-TION (31), SEUNGJUN (31), WYATT (31), YUTO (27). The oldest is HYOJIN, born April 22, 1994; the youngest is YUTO, born March 16, 1999. Birth years are on file for 5 of 6 members.
Members with a nationality other than South Korea: YUTO (Japan)
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Exports 5 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 22 | HYOJIN 孝振김효진ヒョジンKim Hyo-jin | — |
| December 24 | E-TION 이션イーションLee Chang-yun | — |
| January 13 | SEUNGJUN 승준제이어스ジェイアスLee Seung-jun | J-US |
| January 23 | WYATT 와이엇심재영ワイアットShim Jae-young | — |
| Undisclosed | MINKYUN 박민균エムケイPark Min-kyun | MK, 민균, 엠케이 |
| March 16 | YUTO 水口裕斗유토ユーMizuguchi Yuto | U |
Roster source: ONF | プロフィール | ビクターエンタテインメント (Victor Entertainment profile page) (retrieved August 30, 2026)
The official roster page exists but is incomplete or looks outdated, so we’ve marked it as pending.
Age ranking of members (oldest to youngest)
We have full birth dates for 5 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 | HYOJIN | April 22, 1994 | 32 |
| 2 | E-TION | December 24, 1994 | 31 |
| 3 | SEUNGJUN | January 13, 1995 | 31 |
| 4 | WYATT | January 23, 1995 | 31 |
| 5 | YUTO | March 16, 1999 | 27 |
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”.
ONF Members’ Zodiac Signs
Only members with a known birthday are included. Sign boundaries: zodiac index
This page lists all 6 members on ONF’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)
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 ONF's members?
- ONF’s official roster has 6 members. Those with a verifiable birthday on this site: HYOJIN April 22, E-TION December 24, SEUNGJUN January 13, WYATT January 23, YUTO March 16. We don’t have a verifiable birthday source for 1 other members yet, so they aren’t listed. Each birthday’s source is cited on this page and on the person’s own page.
- How many ONF members are listed on this site?
- ONF: Official roster: 6. Of these, 6 have a verifiable birthday recorded on this site. This page lists all 6 members on ONF’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 nationalities are the members of ONF?
- On this site, the ONF members recorded with a nationality other than South Korea are: YUTO (Japan).
- What is the age order of ONF's members? Who is the oldest?
- We have birth years for 5 of 6 ONF members (members with only a birth month and day can’t be ranked by age). Ordered from oldest to youngest: HYOJIN (born April 22, 1994), E-TION (born December 24, 1994), SEUNGJUN (born January 13, 1995), WYATT (born January 23, 1995), YUTO (born March 16, 1999). The oldest is HYOJIN, and the youngest is YUTO.
- What are the zodiac signs of ONF’s members?
- Based on their birthdays: Taurus: HYOJIN; Capricorn: E-TION, SEUNGJUN; Aquarius: WYATT; Pisces: YUTO. Signs use the month and day only, with the boundary dates explained on our zodiac pages.