A standard architectural asphalt shingle roof lasts 25 to 35 years with proper installation and maintenance. Premium shingles with Lifetime warranty designations can extend that to 40+ years in favorable conditions. Metal roofing lasts 40 to 50 years and is virtually maintenance-free after installation. Natural slate can last 75 to 150 years when properly maintained. The most important factors in roof lifespan are installation quality, ventilation adequacy, and maintenance — not just the shingle product itself.