I know the numbers support this but I always wonder why my observations are so different.
When growing up (I'm Gen X) all my friends houses and mine were pretty big. Most of us were lower middle class so these were cheap houses. Land was dirt cheap so houses used the space and still had huge yards. Houses were simple, but spacious.
By the 90s houses had shrunk, since now land was quite expensive so builders had less space.
All the construction going on right now in my town is even tinier, since land prices have skyrocketed, so builders have the incentive to stuff as many tiny units into tiny plots as possible.
So, where are these 3x larger houses these days?