Some Millennials in my timeline are insecure because Gen Zs are telling them their ankle socks age them.
I can't stress enough that you don't need to care about what a bunch of 20-somethings think about your clothes, mainly bc you don't have to care about what ANYONE thinks about your clothes.
When my nibblings point out things that make me look old, I point out that when I was their age, they were regularly shitting themselves. (The ones that had been born at least)
Never take fashion advice from someone whose ass you've had to wipe.