It takes a long time to wear out a Birkenstock, a favorite sandal of Boomers (with or without socks). Here's a comparison of a new pair to an old pair worn daily
Birkenstock Women's Clogs and Mules | Cat shoes, Womens clogs, Womens clogs and mules
Birki’s Birkenstock Boston Clogs Kids Kay Cat Red Comfort Slip On Shoes C10