Yuji Itadori is 15 years old at the beginning of Jujutsu Kaisen, with an official birthday of March 20, 2003, making him 15–16 depending on where you are in the timeline of the story.

How old is Yuji Itadori?

Yuji Itadori starts the series as a first-year high school student, which lines up with him being 15 years old. His character profile and multiple fan and news-style breakdowns list his age as 15 and his birthday as March 20, 2003. As the in-universe year is 2018, that puts him at 15 at the start, turning 16 shortly after his birthday passes in the story’s timeline.

So if you’re just asking “how old is Yuji Itadori?” in the context of the main Jujutsu Kaisen story, the clean answer is: he’s 15 years old at the start of the series, born March 20, 2003.

Fans sometimes joke or speculate about future timelines or spinoffs where Yuji appears much older (even in his 80s), but those are extra scenarios and not his core, canonical starting age in the main series.

TL;DR: Yuji Itadori’s official age is 15 at the start of Jujutsu Kaisen, and he was born on March 20, 2003.

Information gathered from public forums or data available on the internet and portrayed here.