KSI is 33 years old as of 2026, and his year brought two big moves: he became a full-time judge on Britain’s Got Talent series 19 in 2026, and he announced his departure from the Sidemen on May 31, 2026, according to BBC News. Born Olajide Olayinka Williams Olatunji, the London-born creator is one of Britain’s biggest YouTubers, a rapper and a former boxer.
| Full Name | Olajide Olayinka Williams Olatunji |
| Age (as of 2026) | 33 years old |
| Born | June 19, 1993, London, England |
| Occupation | YouTuber, rapper, entertainer |
| Known For | YouTube; Sidemen; Britain’s Got Talent |
| YouTube | 18.5 million subscribers (main channel) / 47.49 million combined (as of July 2026, Wikipedia) |
| 2026 Highlight | Britain’s Got Talent judge; left the Sidemen |
Who Is KSI?
KSI, known as JJ, is a British YouTuber, rapper and entertainer. He co-founded the Sidemen collective and co-founded Prime Hydration, and he built one of the largest English-language YouTube followings from FIFA gaming videos into music, boxing and mainstream television.
Early Life & Background
KSI was born Olajide Olayinka Williams Olatunji on June 19, 1993, in London, England, and grew up in Watford. He started his YouTube channel in 2009 with FIFA gameplay and commentary videos, building a large audience before expanding into comedy, music and the Sidemen group.
Career
KSI’s career spans YouTube, music and boxing. His albums Dissimulation (2020) and All Over the Place (2021) reached the UK charts, the latter at number one, and his boxing bouts with Joe Weller and Logan Paul drew large online audiences. He co-founded Prime Hydration in 2022. In 2026, he became a full-time judge on Britain’s Got Talent series 19, bought a minority stake in Dagenham & Redbridge F.C. on March 3, 2026, announced his departure from the Sidemen on May 31, 2026, according to BBC News, and announced his retirement from boxing on October 10, 2026. As of July 4, 2026, according to Wikipedia, he had 18.5 million subscribers on his main YouTube channel.
Facts About KSI
- He was born on June 19, 1993, in London, England.
- His full name is Olajide Olayinka Williams Olatunji.
- As of July 4, 2026, he had 18.5 million subscribers on his main YouTube channel, according to Wikipedia.
- He became a full-time judge on Britain’s Got Talent series 19 in 2026.
- He announced his departure from the Sidemen on May 31, 2026.
Frequently Asked Questions
How old is KSI?
KSI is 33 years old as of 2026. He was born on June 19, 1993, in London, England.
What is KSI’s real name?
KSI’s real name is Olajide Olayinka Williams Olatunji.
What is KSI known for?
KSI is known for his YouTube channels, the Sidemen collective, his rap albums and his boxing bouts with Logan Paul.
What did KSI do in 2026?
In 2026, KSI became a judge on Britain’s Got Talent series 19, bought a minority stake in Dagenham & Redbridge F.C., announced his departure from the Sidemen, and announced his retirement from boxing.
Did KSI leave the Sidemen?
Yes. KSI announced his departure from the Sidemen on May 31, 2026, according to BBC News.
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