Hardly a day goes by on this forum without someone asking "Am I too old to wear X,Y.Z."
Usually these posts make me laugh because the poster is a child- compared to me 
But it does worry me that so many MNs seem to think that 30 -FFS -is too "old" for some things. These days that's barely out of uni age.
I'm 56 and still wear all the things that younger women wear but with care- skinnies, ( but not painted on), Converse,leggings and tunics, jeans into boots etc etc. I do take care not to show the bits that aren't too good- like my upper arms which are a bit flabby- but overall all my friends are very fashionable in a "toned down" way that suits our age and we all take care of our weight etc and are a size 10-12.
Conversely ( get the pun?) I see much younger women sometimes wearing things they shouldn't which simply accentuate the bad bits of their bodies usually leggings when they have very fat legs, huge muffin tops, and so on.
I just wonder if YOU have a cut off age when you think you are too old for something- and why?