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
Why I Love my Birkenstock Sandals | Stripes and Whimsy
The Best Birkenstock Sandal Dupe — Mary's Little Way
16 Ways to Get Cheap Birkenstocks on Sale - The Krazy Coupon Lady
Hippie favorite Birkenstocks now cost $800
16 Ways to Get Cheap Birkenstocks on Sale - The Krazy Coupon Lady