The life expectance for components in a Home.         

Roofs

            Shingles                                                15 to 25 years, 25 to 30 years up 50 years

            Tile roof                                                25 years to 50 years

Plumbing:  Cooper pipes                                   40 to 50 years

Air conditioning systems expected lifespan      About  15 years

Heat Pumps                                                       About 16 years

Clothes dryers:                                                  About 13 years

Electrical ranges & Refrigerators:                    About 13 years

Microwaves:                                                      About 9 years

Dishwashers:                                                     About 9 years

Shower stalls and pans                                      About  15 years