I’m 67, and all of my grandparents (born in the 1880s*) were married with kids by 1906. On my father’s side, I think they already had 3 kids (out of 5), and on my mother’s side, probably 2 (out of 8). Both of my parents were born in 1913. If they were still alive, my parents would be turning 100 this year!!!
*My paternal grandfather may have been born in the late 1870s.
And yes, I’m the guy whose maternal grandfather married my paternal grandmother.