finkking I agree with you.
I think people are hoping for a magic list of ageing clothes or looks which they can then avoid and not look aged. It doesn't work like that!
My teenagers (15 and 17) wear quite a lot of the things on this thread. One has a bob. Bootleg jeans are back in, or even full on flares. They are getting out of skinnies. They wear chunky boots mainly, but have 'mum boots' and style them with short skirts. They don't look 'aged' because they are young, it's that simple.
It's like 'fringes' are always trotted out. Younger girls don't wear fringes as much, so it's obvious you should grow out your fringe and get curtains- ummm, that will show your wrinkles on your forehead!!! There isn't a way, apart from weird frozen Botox head, to stop your forehead looking 'older', fringe or no fringe. Same for wearing trainers or whatever, if you are older looking no amount of prancing around in trainers is going to help that, wear them as they are practical and stylish and great shoes!
The things that make you look younger IMO are having a fabulous smile (so fixing your teeth if they are stopping you smiling), being welcoming and a fun person, not bitter about life. Style does come into it, but the loveliest person I know (my mum) wears fleeces, straight leg jeans, has a bob and looks absolutely fantastic for 75 because she clearly doesn't faff about clothing too much, just looks 'nice' and IS nice.