I'm sorry this isn't much use to the parent poster, but I think these conversations really need to happen years if not decades before it's time for the change. 70-somethings can be lively and wonderful, but as a generalization they are going to be very set in their ways and extremely loathe to changing their valued routines. At their age, even something simple like getting acquainted with new neighbors (and losing decades-long connections with old neighbors) can be really intimidating. They can have emotional attachments to rooms of their house that they probably can't even verbalize.