See all eight ATEEZ members from oldest to youngest, with verified birth dates and international ages calculated as of September 21, 2026.
ATEEZ has eight members, and as of September 21, 2026, they are between 25 and 28 years old. Seonghwa is the oldest, Jongho is the youngest, and their birth dates are 923 days apart—about two and a half years. Every age below is an international age calculated against the same reference date.
ATEEZ members age list, oldest to youngest
Ages are calculated as of September 21, 2026.
1. Seonghwa (Park Seong-hwa) — born April 3, 1998 — age 28
2. Hongjoong (Kim Hong-joong) — born November 7, 1998 — age 27
3. Yunho (Jeong Yun-ho) — born March 23, 1999 — age 27
4. Yeosang (Kang Yeo-sang) — born June 15, 1999 — age 27
5. San (Choi San) — born July 10, 1999 — age 27
6. Mingi (Song Min-gi) — born August 9, 1999 — age 27
7. Wooyoung (Jung Woo-young) — born November 26, 1999 — age 26
8. Jongho (Choi Jong-ho) — born October 12, 2000 — age 25
Birth order is the clearest way to compare the members because it never changes. The age numbers do change during the year as each birthday passes.
Why the five 1999-born members are not all the same age
Yunho, Yeosang, San, Mingi, and Wooyoung were all born in 1999. On the reference date, the first four are 27, while Wooyoung is 26 because his November 26 birthday has not arrived yet. He turns 27 on that date.
The same rule explains the two members born in 1998. Seonghwa has already had his April birthday and is 28. Hongjoong remains 27 until November 7. For part of each year, they share the same age number even though Seonghwa is older by birth date.
ATEEZ birth dates at a glance
Seonghwa, April 3, 1998. He is the oldest member.
Hongjoong, November 7, 1998. He is the second-oldest member.
Yunho, March 23, 1999. He is the oldest of the five members born in 1999.
Yeosang, June 15, 1999. His birthday comes next in the 1999 line.
San, July 10, 1999. He was born 25 days after Yeosang.
Mingi, August 9, 1999. His birthday is 30 days after San's.
Wooyoung, November 26, 1999. He is the youngest member born in 1999.
Jongho, October 12, 2000. He is the group's youngest member, or maknae.
Three ages change before the end of 2026: Jongho turns 26 on October 12, Hongjoong turns 28 on November 7, and Wooyoung turns 27 on November 26.
How the ages were calculated
International age starts at zero on a person's date of birth and increases by one on each birthday. This is the system familiar to American readers and the standard used for civil and administrative matters in South Korea after age-counting laws changed in 2023.
Older fan posts may use the traditional Korean counting system, or 세는 나이, in which a person is one at birth and everyone gains a year on January 1. That number can be one or two years higher than international age. This article uses international age only, so every member is calculated on the same basis.
If you are reading after the stated reference date, use the birth dates above rather than treating the listed ages as permanent.
Frequently asked questions
Who is the oldest member of ATEEZ?
Seonghwa is the oldest. He was born on April 3, 1998, and is 28 as of September 21, 2026.
Who is the youngest member of ATEEZ?
Jongho is the youngest. He was born on October 12, 2000, and is 25 on the reference date.
Which ATEEZ members were born in 1999?
Yunho, Yeosang, San, Mingi, and Wooyoung were all born in 1999.
What is the age gap between the oldest and youngest ATEEZ members?
Seonghwa and Jongho were born 923 days apart, which is two years, six months, and nine days.
Why do some websites show different ages?
The reference date may be different, or the page may use a different age-counting system. Check the calculation date and whether the ages are international ages before comparing lists.
Image credits: ATEEZ group photo by K-POPIT 케이팝잇 (CC BY 3.0, via Wikimedia Commons); birthday timeline graphic by K Gallery.
