Skin is In

In a season where shorts and skirts are the preferred bottom for most people, I am beginning to wonder at what point do you decide that you can no longer where shorts and skirts that hit above the knee. I mean, at what point does the condition of a persons legs mean they can no longer where revealing clothing. I understand there are those out there that say "who cares, this is what I look like and I don't care what anybody thinks," which is fantastic, power to ya. But then you see those women out there who have got to be 70 years old, and they have shorts on and there legs are wrinkled and saggy and generally very unattractive. Can you say that is borderline offensive? Is it comparable to severely obese people in bikini's? My mother, who is in her 60's now, hasn't worn shorts in years, and I have never seen her in a two piece bathing suit. Is that shyness or just common moderation? And what about 13 year olds that are wearing shorts that could pass as underwear? At what length is appropriate for what age?