My mom lives in a 110 year old house in one of the wettest regions of the United States. The walls are a bit thin by current standards, just 2x4 even though it

My mom lives in a 110 year old house in one of the wettest regions of the United States. The walls are a bit thin by current standards, just 2x4 even though it's two stories with a basement, but it's holding up fine. Rot has never been a problem. She just keeps up on the routine maintenance -- painting about every 10 years, roof shingles every 25 years. It would still be fine 100 years from now, I expect, though I'm certain that when she passes someone will buy the house, gut it, modernize the wiring, plumbing, and insulation, and then rebuild the interior to look as original as possible. Very popular around this area.