>>54893264Arceus tasked Her with a mission to aid Its Champion, thus afforded her lifespan far longer than any human to do so. Who's to say, after she faithfully saw her Task out and the world was saved for the future to occur, Arceus didn't give her back what she had to let go? Fucking Ocarina had Zelda send Link back to re-live his childhood that got stolen by the events of the gme.
There's also the sticky wicket of Volo's last actions being to vow to chase revenge (not really indicating being willing to take a wife or father children) and Cogita's Retreat is situated roughly on Hisui's map where Celestic Town is located in Sinnoh. As we discover in Legends, Cogita is of the Celestic Tribe, one pre-dating the Diamond/Pearl clan. Volo is Cynthia's battle template. Cogita is her ancestor, given Cynthia comes from the "Town of the Celestics", so steeped in lore of the ancient world it could only have come from one who remembered it.