To determine the age of your home's roof, you can follow these steps:

• Check the building permit: The age of your roof may be noted on the building permit. Contact your local building department to see if they have records of the permit for your home.

• Look for physical signs: If your roof is made of asphalt shingles, look for curling, cracked, or missing shingles. These are signs that the roof is near the end of its life. If your roof is made of other materials, look for signs of weathering and wear, such as missing tiles or damage to the flashing.

• Check the warranty: If you have a copy of the warranty for your roof, it may state the age of the roof or the year it was installed.

• Hire a professional inspector: If you're unsure about the age of your roof or want a more accurate assessment, consider hiring a professional roof inspector. The inspector will examine the roof and look for signs of wear and tear, and they will be able to give you a more accurate estimate of the roof's age.

Note: The average lifespan of a roof varies depending on the type of material used and the climate conditions in your area. In general, an asphalt shingle roof lasts about 20-30 years, while a metal roof can last 50 years or more