CORTIS Members' Ages Revealed: The Shockingly Young Lineup Of BIGHIT MUSIC's New Boy Group

CORTIS, the highly-anticipated boy group from BIGHIT MUSIC, has taken the K-pop world by storm since their debut in late 2025, but one of the most talked-about aspects of the group is the surprisingly young age of its members. As of today, December 12, 2025, the five-member lineup boasts an average age that places them among the youngest active groups in the industry, perfectly embodying their concept of "teen swagger" and "raw energy." Their youth is central to their mission: to *Color Outside The Lines* (CORTIS) and bring a fresh, next-generation sound to the global K-pop scene, following in the groundbreaking footsteps of labelmates BTS and TXT.

This article provides the complete, updated profile and current ages of all CORTIS members—Martin, James, Juhoon, Seonghyeon, and Keonho—calculated precisely for late 2025. From the oldest member, James, to the maknae, Keonho, we break down the biography, roles, and surprising background facts that define this rookie powerhouse from the HYBE family. The group’s debut on August 18, 2025, with their single “What You Want” immediately set high expectations, and their young lineup is a key part of their magnetic appeal.

CORTIS: Full Member Profiles and Current Ages (December 2025)

CORTIS (코르티스) is a five-member South Korean boy group under BIGHIT MUSIC, a subsidiary of HYBE Corporation. They are the first boy band to debut under the label in six years. Their name, an acronym for Color Outside The Lines, signifies their desire to challenge norms and embrace unconventional styles. Their US activities are represented by Republic Records.

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• Agency: BIGHIT MUSIC (HYBE)
• Debut Date: August 18, 2025
• Debut EP: What You Want
• Members: Martin, James, Juhoon, Seonghyeon, Keonho

1. James (The Eldest Member)

• Birth Year: 2005
• Current Age (Dec 2025): 20 Years Old
• Nationality: Mixed Heritage (Thai-Hong Kongese)
• Role: Vocalist, Eldest Member (Hyung)
• Trivia: James is the oldest member of the group, establishing the group's young age range. His mixed heritage has generated significant buzz, contributing to CORTIS's immediate global appeal.

2. Martin (The Leader and Main Vocalist)

• Birth Date: March 20, 2008
• Current Age (Dec 2025): 17 Years Old
• Nationality: Canadian-Korean (Born in Canada)
• Role: Leader (Likely), Main Vocalist, Main Dancer
• Trivia: Martin is a globally-minded artist with a Canadian father and a Korean mother. He is widely speculated to be the group's leader and is known for his impressive height of 181 cm (5'11"). He joined BIGHIT MUSIC after studying at Seoul Joongdae Elementary School.

3. Juhoon (The Main Rapper)

• Birth Date: January 3, 2008
• Current Age (Dec 2025): 17 Years Old
• Nationality: Korean
• Role: Main Rapper, Sub-Vocalist
• Trivia: Juhoon is a powerful rapper whose skills were highlighted during the group's pre-debut promotions. Being born just a couple of months before Martin, he is also 17, making the 2008 line a core part of the group’s sound and energy.

4. Seonghyeon (The Performance Ace)

• Birth Date: January 13, 2009
• Current Age (Dec 2025): 16 Years Old
• Nationality: Korean (Born in Seo-gu, Daejeon)
• Role: Lead Dancer, Vocalist
• Trivia: Seonghyeon is a dedicated trainee, having been signed to BIGHIT MUSIC in 2021 and training for approximately five years. He is one of the youngest members and is known for his strong performance skills, often referred to as the group's performance ace.

5. Keonho (The Maknae)

• Birth Date: February 14, 2009
• Current Age (Dec 2025): 16 Years Old
• Nationality: Korean (Born in Suwon, Gyeonggi Province)
• Role: Maknae (Youngest), Vocalist
• Trivia: Keonho is the official youngest member (maknae) of CORTIS. His birthday falls on Valentine's Day, a fun fact that fans often celebrate. At just 16 years old, he showcases the incredible talent and early start of the *Next-Gen K-pop* idols.

The Significance of CORTIS's Young Age Range

The average age of CORTIS members is approximately 17.2 years old as of December 2025, which is notably young for a group debuting under a major, established label like BIGHIT MUSIC. This youth is not just a statistical fact; it is a deliberate creative choice that shapes the group's entire concept and musical direction.

Their debut EP, featuring tracks like "GO!" and "FaSHioN," leans into the 'teen swagger' and raw, unfiltered energy that only a group of this age can authentically deliver. This youthful energy allows CORTIS to explore themes of adolescence, self-discovery, and rebellion, which resonate deeply with their primary demographic—the global Gen Z audience. This approach is reminiscent of the early days of their senior group, BTS, but adapted for the modern, hyper-connected digital age.

CORTIS's Place in the HYBE Universe and K-pop's Future

CORTIS carries the immense pressure and privilege of being the first new boy band from BIGHIT MUSIC since TXT's debut. Their affiliation with the HYBE ecosystem, which includes global superstars like BTS, immediately gives them a massive platform and a built-in fanbase known as the BIGHIT NBG (New Boy Group) anticipation.

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The group’s youth is a strategic move to secure longevity and continuous evolution in the highly competitive K-pop market. By debuting members like Seonghyeon and Keonho at 16, BIGHIT MUSIC is investing in years of growth and artistic development within the group. This allows CORTIS to mature alongside their audience, ensuring they can seamlessly transition through various concepts, from their current "Color Outside The Lines" ethos to more mature themes in the future.

Furthermore, the members' diverse backgrounds—from James's mixed Thai-Hong Kongese heritage to Martin's Canadian-Korean roots—underscore HYBE’s commitment to global expansion. This international makeup, combined with their proficiency in self-production and performance, positions CORTIS as a key pioneer in K-pop’s creative wave. They are not merely following a trend; they are setting a new standard for the next generation of idol groups.

Topical Authority: CORTIS and the Next-Gen K-pop Concept

To truly understand CORTIS's impact, fans must look beyond the initial debut and recognize the various entities and concepts that define their rise:

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• BIGHIT NBG: The initial, highly-searched moniker for the group before their official name, CORTIS, was revealed.
• COLOR OUTSIDE THE LINES: The group's core philosophy and the full meaning behind the acronym CORTIS, emphasizing their unconventional style.
• Debut Album Success: Their debut album made a significant impact, even charting on the Billboard 200, a rare feat for a debut K-pop group.
• HYBE Labels: The parent company that manages the entire ecosystem, ensuring CORTIS has access to world-class production and global marketing strategies.
• Republic Records: Their strategic partnership with this US label is crucial for their Western market penetration and visibility.
• Discography Expansion: Key tracks like "Lullaby" and "JoyRide" showcase their versatility beyond the title track, promising a rich discography in the coming years.

In conclusion, CORTIS’s youth is their superpower. With the eldest member barely reaching 20 and two members still 16, the group is a symbol of K-pop's ever-younger and ever-more-talented pipeline. Their debut in 2025 has cemented them as a vital part of the Next-Gen K-pop landscape, and their journey under the BIGHIT MUSIC banner promises years of groundbreaking music and performance.