Chrono-stasis

The 925th Universe's version of the Land of Oz was placed under a state of chrono-stasis which meant that no one within its borders actually aged. When trying to make conversation about irrelevant topics, Professor Wogglebug once talked about how “one [unfortunate] consequence of Oz's chrono-stasis, besides all the other problematica that has arisen from this decision, is that [he] was sort of excited by the prospect of the Hammerheads dying one day”; he also discussed the fact that, due to the legacy of the Cardinal Witches, a “whole generation” of Ozians were now unable to correctly tell West from East. (PROSE: Lovie Dovie Stuff)

Behind the scenes

In the canonical Oz books, the magical spell which prevents anyone from dying within the borders of the Land of Oz is a more specific enchantment granting immortality to the denizens, instead of being presented as a form of temporal manipulation.