The oldest are maybe old 5-6 years, but they still look great! That said depending on how you store it ymmv. If you keep it in the same pocket as your keys you

The oldest are maybe old 5-6 years, but they still look great! That said depending on how you store it ymmv. If you keep it in the same pocket as your keys you’ll have a different outcome from keeping it in a separate pocket of a bag or just even in its own pocket in your pants.