>>16177680There might be something to this study.
For instance, if we were living in a non-plastic world, the true median age of puberty for European (europe) in 1890 was age 16. White people have a longer childhood age.
However, even during this period of time, a down syndrome trisomy 21 would often hit puberty much earlier, marked around age 9-12.
Today due to the onslaught of estrogen mimics in fucking everything and race integration, female puberty is much earlier.
Even saying this, many women who are extremely low IQ or have marked intelligence issues reach puberty statistically earlier.