This is a painful thread to watch; maxing at Enlightenment and Global ages? There's no upsides, only downsides. Enlightenment and Global ages are temporary ages that shouldn't last more than (about) a month each. Their only purpose is to upgrade useful offense.
The benefit of Industrial over Enlightenment (Planes, Decoy, and more) is big, and the benefit of Atomic over Global (4 more planes, a wonder, a house, bigger museum, far better SAMs, 15 more troop space, Tank Destroyers, better everything including defense, ...) is HUGE.
All this far far far outweighs the tiny benefit of attacking one age lower in multiplayer.
Sorry, this all had to be said at least once in this thread.