2
I'm 174cm, so there's at least two of us. Compared to most of my male relatives I'm a giant, one of my father's first cousins is around 150cm. None of my first cousins is as "tall" as I am.
For what is worth door jambs in Iron Age castros were around 150 to 160cm tall, and the entrances to the balnearios were semi-circular with 40 to 45cm in diameter, so odds are we've always been short.
Bookmarks