How old is too old?

[Logan Allec]

No, I'm not talking about people. I'm talking about wood frame houses. I am new to all this and have been looking at various turnkey wood frame SFR's built in the 1950s and 1960s (before that scares me). I have never lived in a house that old. I know it's case-by-case and depends on the construction, but in general, at what age does your typical wood frame house in a climate like, say, Indianapolis start giving significantly more trouble than it did, say, 10 years prior?