How old is too old to buy a house?

[Benjamin Zwiebel]

Hello All,

I am looking at some properties tomorrow that I hope will be a good investment. There are 2 duplexes and a triplex. They all seem to be in decent repair (and i would obviously get inspections) but what is initially giving me pause is that they are all 80 to 100 years old. 100 year old houses are common in my area, but it begs the question, how old is to old?