I believe that there is no age appropriate look but rather, you have to ask yourself how much attention are you looking to attract in the setting you find yourself? If I'm older and go out in the middle of the day wearing a tight bandage dress or sensual outfits that are common on younger women, I will draw greater attention. That may be your goal. If I just want to blend into the crowd, then maybe I should wear what women my age wear in that particular context.