Women must buy luxury goods after they are 30.

You don't have to buy luxury goods. Buying luxury goods should be based on one's own economic ability, but women after 30 should be relatively decent in dressing and speaking, because women after 30 are relatively calm in doing things and speaking. After 30, more luxuries should be books. Now some so-called luxury goods are just external appearances, but when they really reach a certain age, they need some connotations!