HA. I’m old but not that old. Ha. Well, My college anthropology courses spoke of the evolution of man from the early man to Neanderthal to Cro Magnon to Modern Human. Of course there is a constant evolution, as man has changed noticeably just since our arrival on this continent. Men of the Revolutionary War and Great War of Northern Aggression were much smaller and shorter lived than are we, so we can see evolution in our own families.
The increased size of 20th century Americans seems to be from improved nutrition and health care and not from evolution.