I do agree that we shouldn't use "old lady" as a bad thing (and I didn't in my post) but the fact that an older woman prefers Hotter is exactly what people are talking about when they say "old lady shoes". What it really means is "for people who aren't bothered about style" which does not apply to all old ladies at all, but it's shorthand for out of touch I suppose.
What is unstylish about the sandals OP posted is precisely that they are verging on the hotter-esqe. Clumpy and thick straps doesn't equal uncool, in fact the opposite, but you want to go less hotter look, more marni look IMO.
Not of course that any of this matters in the scheme of things. But YKWIM.
My 80-something mum for example would wear somehting like these and that's the look I find ugly (she'd be telling me I should get some as they're pretty
) but she is not fashiony - however I do know old ladies who are fashiony.
So it's not the right word and it is ageist but I know why people use it and what they mean. It's like if I said "old man slippers" you'd know what I meant :o