Conclusions, social flexibility:
1. Marriage norms and family forms are social constructions and are highly plastic, even in Mexico.
2. Marriage age (including informal unions) has increased greatly over the centuries in Mexico, from as little as 13 years in rural “Morelos” five centuries ago to as much as 22 years by 1930.
3. Likewise, complex families have declined from 75% in 1540 to 15% in 1930.