Yes, stained wood floors can change colour over time. Wood is a natural material that reacts to its environment, and exposure to sunlight, humidity, and air can cause the stain to lighten, darken, or shift in tone over the years. Lighter stains may become slightly faded, while darker ones can develop a warmer or duller look. To slow this process, consider using UV-resistant finishes, area rugs, and window treatments to limit direct sun exposure.