Advancing in Ages

Licaytra Dark writes: I am making a scenario where this is a "normal random map game" but the difference is that players cannot advance in age using the technology in the town center, they must instead get certain attributes, ie: kills, population, etc. and they advance in age by triggers.

How do I do that?

Because if I disable the ages in options, triggers won't let me advance in age...

Thx for help!