Steve, I may not define poor the same way you do. I think poor is more dependent upon your wants and expectations than what you actually have.
One of my grandmothers had 9 kids, the other had 10. Both buried 3 kids before they were 2 years old. One of my aunt's died when she was 60 but the rest lived until they were in their 80's and 90's. Some are still going. One grandfather died in his 50's due to an accident. The other two made it to the 80's and one grandmother made 91.
A cousin wrote a geneology book about several families that grew up in that rural neighborhood. Many of my ancestors were included. A lot of those lived to a ripe old age, but many had siblings that died very young. There are a few exceptions, mainly accidents, but looking at it, if they made it out of childhood, they had a real good chance for a long life. Instead of the 80's and 90's, that was more likely the 70's and 80's. Modern medicine has done a lot in treating heart attacks and strokes. The average life span has increased quite a bit, but the changes in early childhood mortality has probably changed it more than people actually living longer. Both obviously contribute though.
Based on my memories growing up, you could make a pretty good living back in the hills of East Tennesse just farming and such until the mid-1950's. You didn't have a lot of things because you pretty much did not have any spare money, but you did not go hungry, you had a place to live, and had clothes to wear. Then, for different reasons I won't go into (my opinion only on those anyway) you were poor if you did not have some cash. You could no longer just get by just by growing and raising most things. I guess that's called progress.
Their lives definitely required hard work and they could not take off to go see all the tourist attractions of our country. They had animals to feed and crops to take care of. But looking at how long many of my ancestors lived (these records go back to the first of my paternal line that came across in 1635) if they made it past childhood, it was usually not a short life.
Let me tell a story about being poor. One of the places I worked in Africa was in a camp that was so isolated in a river delta you could only get to it by air or water. No roads of any type. I lived in a room that was old and the floor and walls were cracked. It was so damp you had to clean the mildew off the wall above the bed regularly. There was no way my wife would ever consider spending the night in those conditions.
Next to the camp was the native village. They lived in grass huts with dirt floors. Did not need heat but there was no air conditioning. The drinking and washing water came from the river. No electricity or running water. Really primative living conditions. Those people lived a hard life and looked old at 40. They considered what I was living in as luxury. I was considered rich to them and I was. But if they had what I was living in, my wife would have considered them very poor.