Back in my College days my Sociology Lecturer (who was a woman) maintained that Men reached their full social development by the age of 12.
This conclusion was based on the observation that 12 year old boys social lives tended to centre on 3 activities.
1)Watching sport.
2)Looking at pictures of naked women.
3)Hanging out with their male friends.
She concluded that men's social lives, beyond the age of 12,continued to centre on these 3 activities permanently,therefore men reach their full social development by the age of 12.