Dormer window rolled aluminum - what does it look like in 30 years?

[marre696]

Can't find images when I Google and get different answers from different people I talk to.

Some say it's only matte and some say the one in the picture is aluminum.

 

[plåtrickard]

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

 

[Lilllen]

I believe this was installed when the house was new in the 40s, but in any case, it's older than 30 years.