How Long Does a Roof Last in Babylon, NY? Lifespan by Material and Local Factors
https://www.4shared.com/office/dsOnnpHijq/pdf-61247-55533.html
The national roofing industry's standard answer — "20 to 25 years for asphalt shingles" — is a reasonable average, but it's an average built from a wide range of climates, installation quality levels, and maintenance histories