My house was built in the late 1890's. One cool fact, we had to have our furnace replaced it was original to our house, so over 100 years, what lasts that long now? Of course it was in winter, and I was sick as a dog, and my husband had to work. That is good memories. It also had had to have an abatement because of asbestos, luck, lucky me, it was my grandmother's house. But still, a furnace today lasts maybe , maybe 15 years, my sister lives in a newer area she just told me her furnace is 11 years old, so she'll need a new one soon. So it is what it is.