I don't think I've changed much since I retired. Became a granny at 51, so had working and social identities as well, therefore had to look decently groomed, (if not always smart), in jackets, nice tops, skirts or trousers. In retirement, pretty much anything goes, depending on my size at the time - three different sizes of trousers occupy space in my wardrobe - but I veer towards the comfortable/casual: trousers and long jumpers/cardigans, pretty scarves, invariably flat shoes. I like to vary the colour scheme, maybe going off purple at the moment, liking the teal spectrum. My advice is to wear what you really like, experiment too but don't categorise yourself as a grandma! You probably have other identities as well.