Will Aether biome spawn on Old world?

Will Aether biome spawn on Old world?

In this article, we will investigate whether the Aether biome can spawn in an existing Old world.

No, Aether biome does not spawn in Old world by default

Upon world generation, the Aether biome is programmed to generate always on one of the sides of the world as the Jungle biome. However, this also means that old worlds do not have a mechanism to naturally create the Aether biome unless manual intervention is conducted. This implies that you may not encounter this biome simply by playing normally on your existing world without taking actions to artificially summon it.