Invaluable list of the approximate life expectancies of home components.

Alarms, Combination (Smoke/fire/intrusion) – 10 years
Air Conditioner, Central – 15 years (newer units may last longer)
Bathtub, Cast Iron – 50 years
Bathtub, Fiberglass – 10 to 15 years
Boiler, Hot Water – 30 years (depends on quality of water)
Brick Veneer - Lifetime
Cabinets, Kitchen – 15 to 20 years
Cabinets, Medicine – 20 years
Cement – 50 years
Ceramic Tile, (high grade installation) – Lifetime
Chimney, Masonry - Lifetime
Coils, Electric – 15 years
Concrete Block – 100 years
Compactors – 10 years
Conduit, Electrical - Lifetime
Countertops, Ceramic tile, (high grade installation) – Lifetime
Countertops, Granite – 20 year
Countertops, Laminate – 10 to 15 years
Countertops, Wood/Butcher Block – 20 years
Decks, Wooden – 15 years
Dishwashers – 10 years
Disposals – 10 years
Door Opener, Garage (Electric) – 10 years
Doors, Garage – 20 to 50 years
Dryers, Clothes – 14 years
Faucets – 11 to 20 years
Fences – 12 years
Flooring, Carpet (dependent on installation, traffic, and quality) – 11 years
Flooring, Marble,Flagstone , Terrazzo,Slate,Pine,Oak – (dependent on installation, traffic, and thickness) - Lifetime
Flooring, Tile, Vinyl – 20 to 30 years
Freezers, Compact – 12 years
Freezers, Standard – 16 years
Furnace, Gas/oil Fired – 18 years
Gutters and Downspouts – 30 years
Heat Pump – 15 years
Humidifier – 8 years
Microwaves – 11 years
Paint, Exterior (Overall Paints) – 7 to 10 years
Paint, Exterior (Latex, One coat) – 4 years
Paint, Exterior (Latex, Two coats) – 8 years
Paint, Interior – 5 to 10 years
Patios, Brick and Concrete – 24 years
Pumps, Sump – 10 years
Pumps, Well – 10 years
Radiant Heaters, Electric – 10 years
Range, Electric – 17 years
Range, Gas – 19 years
Refrigerators, Compact/Apartment – 14 years
Refrigerators, Standard – 17 years
Roofing, Asphalt Shingle – 15 to 30 years
Roofing, Asphalt Overlag – 25 to 35 years
Roofing, Shake – 15 to 30 years
Roofing, Sheet Metal – 20 to 50 years (depends on gauge and quality of installation)
Roofing, Slate – 50 to 100 years (depends on grade)
Roofing, Tile – 50 years (depends on quality and climate)
Roofing, Wood Shingle – 15 to 30 years
Siding, Vinyl – 50 years
Siding, Wood – 10 to 100 years (highly dependent on maintenance practices)
Sinks, China – 25 to 30 years
Sinks, Enamel Cast Iron – 25 to 30 years
Sinks, Enamel Steel – 5 to 10 years
Stucco Walls – 25 yrs
Toilets – 50 years
Walks, Concrete – 24 years
Walks, Gravel – 4 years
Walls, Brick – 100 years
Walls, Ceramic Tile – Lifetime (High grade installation)
Walls, Drywall – 30 to 70 years
Walls, Plaster – 30 to 70 years
Walls, Stone – 100 years
Walls, Stucco - 20yrs.
Washers, Standard/Automatic Clothes – 13 years
Water Heater, - ( I have found a more accurate time frame would be 6 - 14 years for ANY Water Heater dependent on the quality of the water supply
Waterproofing Finish, Paint – 3 to 5 years
Waterproofing Finish, Plaster – 3 to 5 years
Waterproofing Finish, Stucco – 3 to 5 years
Waterproofing Sealer – 1 to 5 years
Waterproofing Silicone – 1 to 5 years