Asphalt roofing shingles are available in grades with an expected life of 20-50 years depending on the price. However, durability issues and wear-out or material failures occur earlier than expected in some situations. Also, shingles used in warmer climates will have a lower life expectancy, but these types of shingles generally come with 20+ year warranty. Keep in mind, however, that warranties are a marketing device and are not a reliable predictor of lifespan. To be on the safe side, it is wise to demand shingles that meet industry manufacturing standards. Asphalt shingles are a great choice for a roofing material if you are looking for a fairly standard roof, with low maintenance, a great price, and a reasonable service life.