In preparation for Digital Age, we began altering the targets you'll find in PvP matchmaking. A note about it just went live in game. You can find the information below:
"The highest age in DomiNations has traditionally been able to attack not only against rivals their own age, but two ages down as well. As we prepare for the release of Digital Age later this month, we are adjusting the Space Age to briefly have a smaller pool of players to target: Cold War Age and other Space Age bases. (Digital Age targets will automatically be added to the pool of opponents after its release.) Please keep in mind, that this may adjust the additional bonuses you would expect to see when attacking other players.
When Digital Age is released, it will be able to raid Cold War Age and Space Age bases for resources – so be sure to bolster your defenses today!"