We bought our first house in 1968 and it was supposedly built in 1950. It's been added to since, but is still there.
We had a new house built in 1972. It's also had a room added on since and is still there.
We had another new house built in 1977. It's stil there and other than a different color paint on the trim, I suppose it hasn't changed.
We bought our current house in 2005, and it was built in 1991, so this year it's 20 years old. It was apparently re-modeled in 1999, since it had a 1999 HVAC system (replaced with a new one in 2010) and the kitchen range, dishwasher, and microwave were all made in 1999 (appeared new and unused when we bought the place in 2005).