No, not on their own, though it depends on how long a period of time you’re asking about.
With pavers, the color is baked into the product as it’s manufactured. It’s not mixed in at the time of installation in your front or backyard. This means the color will hold much, much longer than with concrete, for instance. But listen, we live in Southern California. We get pounded by the sun. Is there a chance that 15 years from now, pounded by the sun every day, they’ll look a little lighter than they did at install? Yes, it’s possible.