I'm in my 60s. I colour my own hair, it's shoulder length, so I have it down and silky (well I like to think it is ha!) when going out socially, and a neat up do (or a hair claw) when casual. Very practical for me and looks ok, according to others. Not that I care that much, who wants to be curling or straightening every day.
As for clothes, I refuse to wear dresses unless it's a wedding and I now have several in my wardrobe for that. Midi length is a must, not too fitted, but not a sack, not patterned, colour for the season, green, purple and navy colours are mine!. Footwear is flat, or low heeled nice shape over the instep, never court shoes or boots for formal wear, statement handbag (small) to match dress.
I wear trousers all the time, never jeans I just don't like them on me and the shape/style changes with the wind. So I stick to casual stuff and (horror of horrors), mostly pull on stuff, wide leg. Some tailored for funerals in black. Never use shorts or 3/4 length, just cotton/linen/light material for Summer.
Tops are round neck cotton or similar, no logos, some linen tunic style etc. for Summer. I confess to wearing loose waistcoat type things to feel "finished" for the casual look, but not always.
Around the house and heading to the shops etc. Well it's anything that I won't be arrested for, but neat and tidy just the same. I use padded jackets, the shame....
I am probably the biggest frump in history to onlookers. But since I rarely notice what anyone else is wearing, I doubt anyone is looking at me either!