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
Amazon.com | Mephisto Nalia Light Taupe Nubuck/Platinum Star EU 42 (US Women's 12) B (M) | Slides
Mephisto Heike | Women's Thong Sandals | Footwear etc.
Mephisto Heike | Women's Thong Sandals | Footwear etc.