upon inspection of this roof there were 3 main things that immediately caught my eye.
The first thing was the amount of granular loss on the shingles. The granules protect the asphalt and fiberglass in the shingle. When these wear off it leaves the shingle exposed to the elements and they will begin to break down. The fiberglass breaks and the asphalt will start cracking as well
The second thing I noticed were all the staples popping through the shingles. This leaves a hole in the shingle for water to penetrate the roof.
The third and maybe most important thing I seen on this roof were all the broken and cracked shingles caused by wind damage.