The age of breast development -- which represents the first clinical sign of female puberty -- has declined an average three months per decade between 1977 and 2013, according to analysis of data combined from 30 different studies.
from WebMD Health https://www.webmd.com/children/news/20200210/puberty-starts-a-year-earlier-for-girls-now-than-in-the-1970s?src=RSS_PUBLIC
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