When I attack I value XP level and defenses level, not Age. I prefer to attack a 180 AA with Industrial Age defenses, than a 200 GA with a maxed defense system. But I won't skip GA out of mercy as other CWA showed no mercy to me when I was GA. On the other hand, a successful attack over a AA would offer me much more than a GA. It all depends on what I'm seeking at, resources, NTG, medals etc.