The average lifespan of dental veneers can vary depending on various factors such as the material used, oral hygiene practices, bite forces, and personal habits. On average, porcelain veneers can last between 10 to 15 years, while composite veneers may have a slightly shorter lifespan of around 5 to 7 years. With proper care, regular dental check-ups, and maintenance, veneers may exceed their expected lifespan. It's important to follow good oral hygiene practices and avoid habits that may compromise the longevity of your veneers, such as biting or chewing on hard objects.