Looking for the CORTIS members' ages? James is the oldest at 20 and Keonho is the youngest at 17. Here are their official birth dates, age order, member backgrounds, and confirmed group roles as of September 1, 2026.
If you are looking for the CORTIS members' ages, James is the oldest at 20 and Keonho is the youngest at 17 as of September 1, 2026. Juhoon and Martin are both 18, while Seonghyeon and Keonho are both 17.
The members are listed below by birth date, from oldest to youngest. All ages use the international age system commonly used in the United States.
CORTIS members' ages at a glancemberate f birth
Age as of September 1, 2026
Juhoon is older than Martin even though Martin is the group's leader. Seonghyeon and Keonho were born just over a month apart in 2009. These ages will change as each member reaches their next birthday, so the reference date matters.
Meet the CORTIS members
JAMES
James in an official portrait. Source: Weverse Magazine.
Born on October 14, 2005, James is the oldest member of CORTIS. He grew up between Taiwan and Bangkok and entered the group with experience in choreography. Before CORTIS debuted, he contributed choreography to ILLIT songs including “Magnetic,” “Cherish (My Love),” and “Tick-Tack.” Within CORTIS, he continues to take part in developing performances and visual ideas.
JUHOON
Juhoon in an official portrait. Source: Weverse Magazine.
Juhoon was born on January 3, 2008, making him the second-oldest member. Before becoming a trainee, he worked as a child model and appeared in music videos by Korean artists. He has said that meeting the other members helped him take the possibility of becoming an artist more seriously.
MARTIN
Martin in an official portrait. Source: Weverse Magazine.
Martin was born on March 20, 2008, and is the official leader of CORTIS. He is Canadian-Korean and had already contributed to songs by other HYBE artists before his own debut, including TOMORROW X TOGETHER’s “Deja Vu” and ILLIT’s “Magnetic.” His role in CORTIS also reflects the group’s emphasis on members participating directly in music and creative production.
SEONGHYEON
Seonghyeon in an official portrait. Source: Weverse Magazine.
Born on January 13, 2009, Seonghyeon is the fourth-oldest member. He has spoken about growing up with BTS’s music and choosing to audition for BIGHIT MUSIC because of that influence. He performed “MIC Drop” for his audition and trained for several years before debuting with CORTIS.
KEONHO
Keonho in an official portrait. Source: Weverse Magazine.
Keonho was born on February 14, 2009, making him the youngest member of CORTIS. Before becoming a trainee, he was a competitive swimmer. He has connected that experience with the stamina and mental focus required for training and performing.
Does CORTIS have official positions?
Martin is officially identified as the leader, but CORTIS does not use the usual fixed positions such as main vocalist, lead dancer, or rapper. In an interview with i-D, the members explained that all five participate in writing, producing, choreography, performance, and visual direction.
That approach is central to how BIGHIT MUSIC presents the group. Rather than assigning every member a narrow role, the label describes CORTIS as a “young creator crew” whose members help build their music and visual content together. Fan-made profiles may use additional position labels, but those should not be treated as official roles unless the label or members confirm them.
CORTIS group facts
CORTIS debuted under BIGHIT MUSIC on August 18, 2025, with the lead single “What You Want.” Their first EP, COLOR OUTSIDE THE LINES, followed on September 8.
The name CORTIS is formed from letters in the phrase “COLOR OUTSIDE THE LINES.” According to BIGHIT MUSIC, it represents the group’s intention to think freely beyond standards and rules.
Their official fandom name is COER. BIGHIT MUSIC explains that the name combines “COR,” connecting it to CORTIS, with “-ER,” referring to people who stand together. It also echoes the word “core,” describing fans as a central source of support for the group.
Why CORTIS is drawing attention in the United States
CORTIS’s debut EP entered the Billboard 200 at No. 15. Their second EP, GREENGREEN, later reached No. 3, giving the group its first top-10 album on the chart. These are separate from rankings on Billboard’s genre and global song charts, so they should not be treated as the same achievement.
The group also expanded its US presence through live performances. In February 2026, CORTIS became the first K-pop act to perform during halftime of the NBA All-Star Celebrity Game. Their first North American tour later sold out across six cities, ending with two shows in San Francisco in August 2026.
For new listeners, “What You Want,” “GO!,” and “REDRED” offer a quick introduction to the group’s music across its first two EPs.
Quick answers
Who is the oldest CORTIS member?
James is the oldest member. He was born on October 14, 2005, and is 20 as of September 1, 2026.
Who is the youngest CORTIS member?
Keonho is the youngest member. He was born on February 14, 2009, and is 17 as of September 1, 2026.
Who is the leader of CORTIS?
Martin is the official leader. He was born on March 20, 2008, making him younger than both James and Juhoon.
Does CORTIS have fixed member positions?
No fixed vocal, dance, or rap positions have been officially assigned. The members have described CORTIS as a collaborative group in which all five participate in the creative process.
Image sources: BIGHIT MUSIC (featured image); Weverse Magazine (member portraits). Age chart created by K Gallery.
