The answer to 'how long does downspouts last' is that downspouts typically last between 20-30 years with proper maintenance. Downspouts are an essential part of a home's drainage system, directing rainwater away from the foundation and preventing water damage. The lifespan of a downspout can vary depending on the material it's made of, the climate, and how well it's maintained.
Downspouts made of aluminum or galvanized steel tend to last the longest, often 25-30 years or more. Vinyl and plastic downspouts may only last 15-20 years before needing replacement. Regular cleaning and inspections can help extend the life of any type of downspout by preventing clogs and catching any signs of wear or damage early.