When you put science into play, assuming ghosts are real, the age of the building should have no relevance on whether or not a building is haunted. If ghost or spirits are manipulating energy in order to manifest or do what they do, then they can manipulate energy wherever there is energy to manipulate. This could be in an old Victorian era home, at the neighborhood park, or even at your local grocery store. It shouldn’t matter.
A building’s age however, may have some relevance on the frequency of hauntings. Older buildings have witnessed more events than newer buildings, and some of those events may have been tragic and unexpected. With older buildings, it is much more likely that people have passed away in the building. In the 1700’s and 1800’s, many people died in their homes at a young age from devastating diseases like cholera, smallpox, scarlet fever, and more. These tragic deaths remain forever intertwined with the building’s history. Many paranormal researchers and ghost hunters believe that if someone died in their home, and still had some unfinished business in life, they may have decided to stick around. Or, they may have loved their home so much, that they refuse to leave. They may not even know that they have passed on.