The dataset you linked is from 1971. The older cohorts were born near the turn of the century when nutrition wasn't exactly the greatest for large segments of

The dataset you linked is from 1971. The older cohorts were born near the turn of the century when nutrition wasn't exactly the greatest for large segments of the population. It's most likely that the skew is due to environmental factors rather than ethnic ones there. See [1]. Age related height declines don't even start until age 40 and are quite small for some time, so it's unlikely to be a factor in dating-related data sets. See [2]. [1] https://academic.oup.com/jn/article/136/2/473/4664347 https://academic.oup.com/jn/article/136/2/473/4664347 [2] https://www.ncbi.nlm.nih.gov/pubmed/2807265 https://www.ncbi.nlm.nih.gov/pubmed/2807265