When I think of old people clothes, I see it more like elastic waisted pants and tunic style tops? So like -- 50 year old and up? As it stands now, I would think I am already wearing "old people" clothes if that means posh blouses and pencil skirts/slacks. I just dress for the occasion although I do like to make sure I have something that can be considered "youngish"on.
Outside of that, pretty much athletic wear when lounging about. Is that considered old people's clothes?