The furnace guys got us running yesterday and it stayed running, but they are back this morning to change out a pressure switch that was throwing codes and not maintaining expected power.  I had a moment last night while I thought about things - most everything in this house is getting to that age where I can expect to see issues.  I guess it's time to mentally (and financially) prepare.  I will do my best to not complain about the cost and to remain grateful that I am able to get the parts and repairs necessary.