The following list will give you the typical life expectancy of the major systems and appliances in your home.

Roofing
Standard Asphalt Shingles – 12 to 15 years
Premium Asphalt Shingles – 15 to 30 years
Wood Shingles – 10 to 20 years
Concrete Tile – 20 to 40 years
Slate Tile – 40 to 80 years
Roll Roofing – 5 to 15 years
Metal – 60 years

Heating
Forced air furnace – 10 to 25 years
Water boiler (welded steel) – 15 to 30 years
Water boiler (cast iron) – 30 to 50 years

Cooling
Central Air – 10 to 15 years
Window air conditioning – 10 to 20 years

Plumbing
Galvanized water pipe – 20 to 25 years
Water Heater – 5 to 15 years
Sewer pump – 5 to 10 years
Well pump – 10 years

Appliances
Dishwasher – 5 to 12 years
Garbage disposal – 5 to 12 years
Oven – 15 to 20 years
Washer – 5 to 15 years
Dryer – 10 to 25 years