Physically, Asians tend to mature most slowly (then whites, then....).
Puberty? Isn’t that largely a function of weight, at least for menarche, or is it other measure like height, etc. i think the character written languages would be part of it. It must be a lot more difficult to learn to write in those languages.
“Cross-racial differences in four age subsets indicate that Asian and Hispanic children mature earlier than African American and white children. “ This is from the discussion, which also states there are significant limitations to the study