Assertion: puberty's age | /r/HasProperty | 10-12 years
Facets:
value: in 15-16 years
type: TEMPORAL
Source sentences:
text: It says that compared to the 19th century, children are entering puberty more and more, because the average age at which children reach puberty is 10-12 years on average in the 21st century and 15-16 years in the 19th century.