It’s never too old. The information above is quite true. A house that’s been standing for over 100 years was probably built and a better value than one built this year. I’m very familiar with several houses and buildings much old than the ones you are looking at, and they will likely be there long after many modern homes are gone. My house may be no older than 75 years making mine the youngster in this group. It needed a lot of work moving in, but my homeowners policy required me to insure it at twice the purchase price because the replacement cost would have been so high, and that was in the midst of the housing boom, not after the bubble burst.