Married people reported being happier than those who are cohabitating, single, divorced or widowed. COMMITMENT IS DIRECTLY RELATED HAPPINESS
People who were never married were more than twice as likely to die early as people in a long-term relationship. You have more of an urge and want to live for the other person.
Compared to marriage, cohabitation, generally, led to a shorter lifespan. People in other relationship generally don't have the same will to survive than those in more committed relationships.
Marriage has positive outcomes on BMD especially in men who married after the age of 25. In health marriage proves to help in bone strength.
Married men earn between 10%-40% more than single men. Marriage drives men to provide for more than themselves.