Jujutsu Kaisen Modulo is a spin-off manga written by Gege Akutami, published in Weekly Shonen Jump starting the 8th of September, 2025, and it takes place 68 years after the Culling Game of the main series. The story is set in the year 2086, several decades into the future of the original Jujutsu Kaisen timeframe as reported. This time jump raises key questions concerning the future and age of core characters, particularly Yuji Itadori, who has been known to reappear in Jujutsu Kaisen Modulo.
According to the 68-year time lapse and the age at which he is portrayed in the original series, Yuji Itadori would be around 83 years old in Jujutsu Kaisen Modulo. At the age of about 15 -16, when the major series concludes, an accumulation of 68 years puts him in his early eighties. The official Jujutsu Kaisen Modulo timeline data of Weekly Shonen Jump supports this estimate.

A publicly available Chapter 10 of Jujutsu Kaisen Modulo depicts a hooded Yuji Itadori standing in a crowd, which is a direct confirmation of the source that he is alive indeed. Moreover, Modulo calls him the greatest known sorcerer on Earth, which is a title of high importance in the changed world of 2086.
The calculation of the age is based on the well-known canon information. Modulo takes place exactly 68 years following the original series event, in 2086. Since Yuji was born sometime during the early 2000s, his age in Modulo can be mathematically predicted, and thus the estimate of 83 years. Although Gege Akutami or Shueisha have not directly claimed that Yuji is 83 years old, the calculations are pegged on the official period.

It is worth noting that, despite his age being chronologically advanced, Yuji feels much younger in the picture that he has been presented in Modulo. His relatively young appearance implies that his body is not aging in a normal way. In keeping with the lore of Modulo, some fan interpretations suggest that his rare physiology (as the previous vessel of Sukuna, and the Death Paintings) might be able to slow or change the way he ages.
This explanation is also backed up by the hypothesis that Yuji does not lose his strength and vitality because of the curse-related issues. His abnormal biology and his relation to Sukuna could be a factor that keeps him physically fit even though he is very old. These chances indicate how the narrative of Akutami in Modulo integrates the aspects of sci-fi with supernatural mechanics, where aging becomes a focal point, not a back story.
Jujutsu Kaisen Modulo -- Timeline Context and Canon Implications
Jujutsu Kaisen Modulo has a time gap of 68 years and will span six months and conclude in about three books. The addition of that time jump to the known age of Yuji in the main series brings to focus the 83-year estimate. Nevertheless, the concept of Modulo also suggests that he is still a very potent and topical character, as it has been mentioned by the characters that he could be a warning against the dangers of aliens.

Additionally, since there is a time gap and he does not appear to have aged, it is posited by many critics that the aging of Yuji is possibly due to his supernatural nature. The element of science fiction introduced in the spin-off, in the form of Simurians and other alien dangers, makes it even more unclear how it is possible to find such a youthful man. Instead of being merely old and possessing great strength, it appears that it is more likely that his longevity and power are strictly connected with curse energy or other storytelling strategies.
To sum up, according to the official schedule in Jujutsu Kaisen Modulo, Yuji Itadori would be approximately 83 years old, as there would be a 68-year gap between the first series and the second. His age should mean that he is weak, but his appearance in Modulo suggests that he is not aging like any other person would. This brings out great narrative consequences, as it can only be implied that his survival as the most powerful sorcerer on earth depends on some unexplained supernaturally related conditions and not just his time of existence.