The lifespan of a masonry chimney can vary depending on several factors, such as the type of material used, quality of construction, and maintenance. However, a well-built masonry chimney can last 50 to 100 years or more on average. It’s important to have your chimney inspected regularly by a professional to ensure it’s still structurally sound and not a safety hazard to your home and family. With proper care, your masonry chimney can last for many warm and cozy winters.