age of reason

Short definition from Wiktionary

Noun

1. 1
   Seven years of age, at which age a person is morally liable for the sins that he or she commits.
2. 2
   Age at which a person is able to distinguish right from wrong and make their own decisions.

Proper noun

1. 1
   Alternative letter-case form of Age of Reason
2. 2
   Synonym of Age of Enlightenment