Definition
Your roof's age is basically its countdown timer. Most asphalt shingles last 20-25 years, so knowing the age tells you whether you've got decades of protection or a replacement due soon.
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Roof lifespan varies by material: asphalt shingles (20-25 years), wood shakes (25-40 years), metal (40-70 years), and tile/slate (50+ years). Climate, ventilation, and maintenance significantly affect actual lifespan. Inspectors determine roof age by examining installation dates on permits or shingles, assessing weathering and deterioration, and estimating remaining useful life. Roofs approaching or exceeding typical lifespan require budgeting for replacement.
Pro Tip
Know your roof's age and plan for replacement. Don't wait for emergency repairs—budget when you're at 70-80% of expected lifespan.
Example
A home inspection revealed the asphalt shingle roof was installed 22 years ago. While shingles typically last 20-25 years, this roof showed significant deterioration with curling, granule loss, and missing shingles. The inspector estimated 2-3 years of remaining life and recommended budgeting $12,000-15,000 for replacement.