All good things must come to an end.
As you play Romans: Age of Caesar, the houses are in constant battle with each other trying to secure the most Glory. Houses need Glory to win rounds and eventually whole Epochs. Once Epoch VII, the final Epoch has been won, the game world will end. As a game world ends, new ones are sure to open and the victors of the previous world will have plenty of rewards to bring with them to help conquer new lands.
All Buildings, Resources, Research and Prestige is world specific and cannot be transferred to new worlds.
Rest assured your account and any cards or Trajans you may have will carry over into any new worlds you might wish to play on.