Your people are living within the ruins of their former greatness, unable to understand let alone duplicate the feats of their forbearers. Members of your culture are often superstitious, even worshipping past technology or their former achievements.
Comfortable: This is the middle class of any Culture, regardless of the average wealth of its citizens. These folk usually live in clean, nicely apportioned homes or apartments, often in better neighborhoods. They eat regularly and occasionally very well.
In adult life you gain a rival who seeks to undo your character, they will attempt to hinder your efforts until they get what they want. (work with your DM to determine details)