Assertion: age group | /r/HasProperty | researcher
Facets:
Source sentences:
text: When studies began to include younger age groups, researchers (e.g. Ash 1982; Cedergren 1973, 1988) discovered that the frequency of incoming linguistic changes is highest among 15- to 17-year-olds, but lower among 11- to 14-year-olds and people in their twenties.