A residential roof is generally considered old when it reaches 20 to 25 years of age, which marks the standard expiration threshold for traditional architectural asphalt shingle systems. While high-end materials like slate or metal can endure for decades longer, asphalt roofs approaching this two-decade milestone typically exhibit advanced material degradation, including widespread granule loss, curling shingle tabs, brittle adhesives, and heightened vulnerability to leaks during severe weather storms.
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