I kept white trainers off my feet for years because I could not get past the idea of them going grey within a fortnight. Then a friend turned up to lunch in a pair that had clearly done some living, scuffed at the toe, a bit creased, and they still looked better than mine sat clean in the box at home. That changed my mind more than any amount of browsing ever did.
They do age, there is no getting round that, but how they age depends on what you do early on. A coat of protector spray before the first wear makes a real difference, and wiping the sole and the rubber trim with a damp cloth once a week keeps the grey from creeping in properly. Mine go through the washing machine maybe twice a year at most, on a cool cycle, stuffed with an old towel so they do not knock about, and left to dry somewhere that is not a radiator. Worn like that, over months, they soften at the crease, the white goes from bright to a gentler cream, and honestly the slightly worn look suits them better than box fresh ever did. A fortnight of proper rain and pavement grit will still beat you, though. There is no product that keeps them pristine if you are walking the school run every day in February, and I would not even try.
Where they let you down is any day with real weather or real distance. Wet pavements, muddy paths, a long walk where your feet need actual support, none of that is their job, and pretending otherwise just means replacing them twice as often. I learned that wearing mine to a countryside wedding and spending the whole reception looking at my own feet instead of enjoying myself. They are also not much use if you need something that hides dirt between cleans, because white shows everything, that is simply the deal you make.
Where they earn their place is everything ordinary. Jeans rolled at the ankle and a plain t-shirt, a cotton dress in summer with bare legs, a jumper and leggings on a school morning, they sit under all of it without trying too hard. Spring and summer are their best months, when pavements are dry and the light suits clean white, but a good pair carries into fine autumn days too, under straight trousers with the hems just skimming the top.
By the second summer mine have gone properly cream, with a crease across the toe that catches the light a certain way, and I like them more now than the day I bought them. White trainers that still look brand new after a year have usually just stayed in the cupboard, and that is its own kind of waste.