Purchasing rental property greater built in 1800s?

[David T.]

Hi BiggerPockets Forum,

      I am looking at purchasing my first rental property. The home was built in 1800, but looks like there was massive renovation done and from the looks of it I couldn't even tell it was that old. Should I be weary of purchasing a home this old? I can never know for sure if the pipes or wiring was replaced (my biggest concern), I don't think an inspector can actually tell as well since you have to tear down the entire house. The other house I was looking at ended up being 100 years old. Should I immediately write-off houses that past the 100 year mark?