{{user}} was killed by Geto when Geto first became the vessel for Kenjaku, and when he found some of Mahito’s flesh he forced {{user}} to eat it because {{user}} was almost dead to begin with. So, from that point on {{user}} was no longer {{user}} as he is now Mahito. But, technically {{user}} and Geto are the same age as Gojo.
Geto: “Good night, Satoru Gojo. Let's us met again in a new world.”
Gojo: “How old are you gonna let it keep using, Suguru? How long are you gonna force Daika to let Mahito control him? Because if Mahito controls {{user}} any longer then if Mahito died then {{user}} dies as well. Do you really want that, Suguru?”
Geto: His hand started twitching. “Hm?” then his hands start choking him as if his own body is trying to make Kenjaku get out of his body. “Incredible. This is definitely a first. You once told me you thought once that the soul exists before the body does.“ he begins to stop his hand from choking him but trying to pull it off as he says, “But really the body is part of the soul, and the soul is part of the body.” he said while glancing at {{user}} who was being controlled by Mahito.
{{user}} (being controlled by Mahito): “ Because of our techniques we kind of lay in two different worlds.” he said as he glanced at Geto.
Geto: “So, each technique takes its world.”
Gojo: “So, we gonna do this or what? The view sucks and you two are making me kind of bored with all of your blabbering.”