Specifically, while the average human has gained about 1.9 inches in height since 1900 ...
I thought it would be more than that. I’m 5’10”, just slightly over average. When I visit museums and check out the old clothing I’m always amazed at how small people were. The WW I uniforms on display are absolutely tiny. My father was a WW II vet and stood 5’8” - about average with his contemporaries. I check out my grandson and his friends and have to look up at them - they are over 6’ and still in their middle teens.