What do you think of the idea that Jesus, peace be upon him, being alive, would thus be older in terms of the duration of his existence in humanity than even Noah, peace be upon him?

Jesus, peace be upon him, is alive and has not died. He remains in the heavens until he descends to Earth at the end of time. It is not surprising that his life span is longer than that of Noah, peace be upon him, for indeed, life spans are in the hand of Allah, the Almighty, who prolongs the life of whomever He wills.