They cant travel the world anymore since they are at the point diesel is going bad. Unless they set up battery powered cars.

And he's young enough for it to be out of 2400

Well in a previous episode we saw that Rafi wasn't always demented. He had a wife and kid who died and he went crazy after he entered an asylum.

It's weird that Jeff misspoke and said she was then. And that they aired him saying it. And that there is video of her at Ponderosa.