Not all shingle brands are the same in quality. I stay away from Atlas, IKO, BP and some others. I would guess your house in Lancaster had IKO's on. Ridge venting is the best venting IF you have proper soffit venting. This year, on some of my customers house's (boy do I love some of the big roofing companie$ in WNY) I have had to remove gutters, facia metal, and vented soffit panels (added $$ to the homeowner) so that I could properly cut out the wood under the VENTED SOFFIT panels which the other in$talling contractor FAILED to do. Proper soffit venting is key.
If you have Box or Mushroom venting near your peak, look around the vent. If you see a black ring around your vents, super heated exhaust air, chances are you are under vented. Add more venting.
The roof on my house, high wind area, no shade so the sun blasted it for 24 years. It was rated for 25 years.
It could have lasted longer but I had some down time so I decided to replace it with a 50 year ELK High Def. shingle.
On a side note, use GRACE Ice and Water shield. It's the best and worth the price.