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Born: 19 June 1993 · Age: 33
KSI is 33 years old as of October 2026. He was born on 19 June 1993.
KSI grew from FIFA gaming videos into one of Britain's biggest entertainment brands. With the Sidemen he built a media business that fills stadiums for charity football. He has scored chart hits as a rapper and helped turn influencer boxing into a big event. His drinks company made huge sales, though it also drew criticism. He shows how creators now run real businesses. He has also spoken openly about his difficult school years.
Olajide Olayinka Williams "JJ" Olatunji ( born 19 June 1993), known professionally as KSI, is a British YouTuber, influencer, musician, and former professional boxer.
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Profile
British YouTuber, born 1993
KSI was born in London on 19 June 1993.
His real name is Olajide Olatunji.
He is a founding member of the group Sidemen.
He co-founded the drinks brand Prime with Logan Paul.
Career highlights
Did you know?He scored a goal at Old Trafford in the Sidemen charity football match.
Questions people ask
1623–1662
b. 1945
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1566–1625Missing someone? Suggest them
b. 1946
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1265–1321A newspaper from their birth date
The front page from the day they were born, a classic keepsake.
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Reviewed by the Who Shares My Birthday editorial team.
Last reviewed: October 2026