There are a surprising amount of activities you can’t do until you reach a certain age, like drive a car and rent a hotel room. On the flip side, you apparently can become too old to do certain things, too. That includes one rather commonplace habit: wearing jeans.

The fashionistas believe it’s possible to age out of your favorite jeans. There’s a certain number, however, when experts advises dropping that denim in a donation bin. And this isn’t just a matter of personal preference; the blogger even backs up her claim with statistics.

The data was collected by CollectPlus, a UK courier company that recently surveyed 2,000 national shoppers. They were asked to share their shopping habits and wardrobe preferences—all the way down to their perfect pair of jeans.