The answer to 'how long does soffit last' is that properly installed and maintained soffit can last 20-30 years or more. Soffit is the exterior material that covers the underside of a roof's overhang, protecting the rafter tails and providing ventilation. The longevity of soffit depends on the material used, the quality of installation, and how well it is maintained over time.
Soffit made from durable materials like aluminum or vinyl can last 20-30 years with minimal upkeep. Wood and fiber cement soffits may only last 15-20 years before needing replacement, especially in harsh climates. Proper ventilation, regular cleaning, and prompt repair of any damage are key to maximizing the lifespan of your soffit.