A staggered retirement would be great! I think that this would also be perfect if combined with grandchildren, in the sense that they would be able to spend a lot of time with grandparents, giving some space to parents, but also setting up the scene for experienced knowledge transfer in the things that are important.
I believe that one of the reasons the world is the way it is now, is because a lot of knowledge is not transferred, as we live so isolated from each other, even within families. We used to all be in the one house.