He isn't saying they would be suited with something smaller or they should move. Just stating the fact that from purely arithmetic reasons it's not optimal for

He isn't saying they would be suited with something smaller or they should move. Just stating the fact that from purely arithmetic reasons it's not optimal for retired people to live in big houses with bunch of empty unused bedrooms. That is indeed factually inefficient use of the space. It doesn't mean they are somehow wrong to want to stay in their houses they paid for fair and square. Just pointing out the problematic situation in real estate market as there is very low supply of new property.