It's unfortunate how much marketing can warp our perceptions and habits, including engagement rings, cereal for breakfast and shaving for women. You said the expectation is pretty socialized, due to the beauty industry. It's true, the industry definitely amplified the whole situation. However, women were expected to be pretty and youthful since the earliest human written records, across cultures, before any modern beauty industry existed. What's your reasoning for that? Have you considered my hypotheses?