Assertion: boy's father | /r/HasProperty | 47.0 years
Facets:
Source sentences:
text: The average age for biological fathers was 37.7 years, for stepfathers 38.9 years, for adoptive fathers 47.0 years, for mothers' boyfriends 39.3 years, for combination fathers 34.8 years, and for male nonparents 40.8 years.