The lifespan of aluminum sheets for roofing can vary depending on the quality of the material, installation, and environmental factors. On average, a well-maintained aluminum roof can last between 20 to 50 years. High-quality aluminum roofing materials, when properly installed, can even exceed this range, offering a lifespan of up to 70 years. However, it's important to note that regular inspections and maintenance are crucial to extend the life of any roofing material, including aluminum.