What year did electricians stop using the old k**b & tube wiring in homes.

Question

I am moving into a old farm house and trying to find out how old the house is. It has 8 foot ceilings and the wiring is the old k**b and tube. It has one 30 amp.2 pole 240 volt s***w fuse discount on the outside service. I am having it rewired of course but I would like to know close to the age of this house. All the ceiling and walls are 1X6 ship lap inside and outside and ceiling. All the lumber is southern yellow pine and VERY hard wood. Can anyone give me an idea the age of this house?

Answer 1

2001 on most houses on others they still use them.

Answer 2

Looks like by the 1940's it was no longer cost effective.