Start with the paperwork: Parma building permits and the seller's disclosure give install years more often than people expect. Then look at the roof itself - heavy granule piles in gutters, curling at shingle edges, and exposed fiberglass mat at worn spots are age written on the surface.
The local context matters: roofs installed in Parma's early-2000s wave are 20-25 years old now, which is end of life for the shingles of that era regardless of how tidy they look from the street. Attic evidence settles arguments - past-leak staining patterns and decking condition do not lie.
An inspection report with photos turns 'we think it is old' into a dated condition you can budget, insure, and negotiate with. That is the right first step when the math is unclear.
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