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
Arizona Birko-Flor White | BIRKENSTOCK
Birkenstock sandals ARIZONA SCHMAL MAROON
Birkenstock Narrow Vs. Regular - NuShoe
Sandalia de mujer Birkenstock Arizona cobre metálico cama suave normal estrecha | eBay