ggmoyang
Emperor
The problem is that they don't -- as Leyrann also mentioned, the warehouse bonus on Granaries disappears after the Antiquity Age, at least if the UI is to be believed.


Thing is, you can't believe the UI in Civ 7.
The effect of legacy ageless buildings stays the same, notice the grassland tile I highlighted and the horse pasture tile gets +1 food with granary built.