I own an old home. One part is 222 years old, and the "newer" part is 190 years old. It is very well insulated, and even with no heat never goes below 55. We can go away and don't have to leave heat on.
I totally disagree with ShootersCenter . Older homes were and are made to last. Obviously, mine has been around almost 225 years. No home today will be standing 225 years from now. They will have fallen down from the poor quality materials they are made from. I saw brand new $600k houses when I use to clean. Not even one year old, and the walls were shifting, and cracking. HA. You won't find me buying a new house.
Not all all homes have lead paint. That can be stripped out. Yeah, they may be a little out of square, but who wants a square/plumb house. Square homes have no character and looks like every other home on the block. They aren't made with the same quality, because people don't have the same workmanship quality, They are made of dry wall, cinder blocks and pressed board lumber. Oh, and plumbing and electric can be updated to.
Old houses have much more character than any new "replica" house that can be built. They have a history and as pstraubie48 states, "stories to tell".
I have lived in my old house for 6 years, and have spent hardly anything on "the money pit", because the house was kept up.
Hats off to old houses!