Certain regional differences also apply... my wife's mother's side were all very tall (approaching 180cm) but we're pretty sure they are related to a strain used for the Imperial Guard way back when. My wife's father's side were all quite short (even the men rarely broke 160cm). My wife and all her female cousins on her dad's side (there were 9 aunts and uncles) are mostly around 150cm.
Japanese raised in America or Canada will *tend* to be a bit taller due to diet differences... and Japanese in Japan have been quietly getting a bit taller each generation.
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