And yet the Observatory is "no age" and produces current age goods.
and the rogue hideout is all ages but produces no age units
btw
maybe I make my own suggestion because watchfires and ritual flames don't fit in the behavior of all other all ages buildings
because all other buildings of all ages shows the age of the player
for example: wishing well / fountain of youth, victory tower, the gong, ...
and for people who think what is different to all of those all ages buildings compared to other buildings with a specific age?
those advance automatically to your age without using a renovation-kit / 1-up-kit