I don't think that anyone should be dictated to as to how they 'should' dress, regardless of age or gender. After all, there are plenty of much younger women who don't look so hot in micro minnies either, not just those who are older. I do agree with Annie, though, that it's not so appropriate for very young girls to wear them. It's tragic that many little girls don't have the chance to be simply children, rather than mini adults.
No one over 20 shd wear them, especially if wearing flip flops, have varicose veins, pillar legs/ankles. Mini skirts are for teenagers.
They are unattractive on older females and no one needs them anymore. Many have spotty, unhealthy, unattractive flesh oozing out of tight, bad fitting clothes already. We've all seen too much = put it away! No one is interested any more.
How could there be such a thing!
It is up to the individual as to how long they want to wear a mini skirt, not up to an outside to dictate to anyone.
I would not wear one anymore as my knees are not as nice as they were (naturally) when I was young and for that matter, I guess nor are my legs as gravity sets in everywhere, so I do not see how anyone could say there is an age where you cannot wear any thing.
Also there are many young people who "should not" be wearing mini skirts, but that is only MY opinion and is not therefore correct or incorrect, but merely MY opinion.
I loved miniskirts in 1960s but definitely there is a fine line at a certain age that miniskirts should not be worn. I don't know if its a specific age thing but women at some stage lose the "tone" they had in their teenage years. I don't think it is a muscle thing but maybe more of a skin thing.
The other MAJOR difference between wearing a mini in 1960s and wearing one now (at any age) is IMO only, the fact that in the 1960s they were not worn with stiletto or very high heels. Nowadays they are. In the 1960s they were worn with flat shoes (not ballet flats) but very low heels and visually it makes a whole lot of difference. The shift dress worn in the 1960s were very short and still somehow didn't look as bad as say a mini in the bandage style dresses or skirts worn today. Stockings or rather pantihose were worn in 1960s and lots of times those pantihose were white.But now bare legs are sported and the look is very different. In the 1960s older women also wore much shorter or above knee dresses and skirts but, I think because they wore stockings, a few older ladies got away with it (once again - got away with it more than older ladies wearing miniskirts without stockings).
Maybe it is knowing "how" to wear certain styles.
Whatever, certainly in the 1960s there were young and old ladies who should never have gone within cooee of a miniskirt. My sister-in-law was one such girl but her MOTHER insisted that having big legs should not deter her from having as much fun as other girls. I never got over the fact that a mother could do that to her own child. I know that comment will upset some other commenters here.
Wear mini skirts if it pleases you and no-one else. Do "we" actually know when to stop wearing the short skirts or doesn't it really matter? I no longer have the legs or figure for short skirts but think I still look good with the length just above the knee, wear with tights or leggings too. If it feels comfortable and you think you look good then go ahead...