Anthropologists have found that in virtually all traditional, non-western cultures, the transition to adulthood is clearly and explicitly marked by

The answer is "it is marked by marriage".

Marriage is viewed as the key change to adulthood since they prize the collectivistic estimation of reliance more profoundly than the individualistic estimation of freedom. conventional societies hoist marriage as the key progress to adulthood since they prize the collectivistic estimation of reliance more exceedingly than the individulaistic estimation of freedom and marriage signifies that a man is going up against new associated connections outside the group of cause.

Ibelieve appendix i maybe wrong