Those are copper in the pictures..
Aluminum becomes dull, though I don't know how long it takes.. look at barn roofs, often corrugated Aluminum
 
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marre696
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I believe this was installed when the house was new in the 40s, but in any case, it's older than 30 years.
Close-up of an aged metal roof surface believed to be from the 1940s, showing texture and weathering.
 
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marre696
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