Question about razing cities in civ7

In pre-release videos I've seen that razing a city will give you a -1 War support in all your wars. Does this negative modifier last until the end of a single Age or does it persist permanently? Picture for reference taken from boesthius's Isabella video.

In pre-release videos I've seen that razing a city will give you a -1 War support in all your wars. Does this negative modifier last until the end of a single Age or does it persist permanently? Picture for reference taken from boesthius's Isabella video.