Gap 1969 Standard Jeans

Men’s Gap 1969 Standard jeans. Worn and washed many times. Still plenty of life left in these jeans. There are two circular spots, one on the front, one on the back. I thought maybe the spots were getting thinner but they feel the same as the rest of the denim. Perhaps it’s just a flaw in the material 🤷🏻‍♀️. Measurements in photos. Smoke free, cat 🐈 🐈‍⬛ friendly home.