of age
of age {adj. phr.}
1a. Old enough to be allowed to do or manage something.
Mary will be of driving age on her next birthday.
1b. Old enough to vote; having the privileges of adulthood.
The age at which one is considered of age to vote, or of age to buy alcoholic drinks, or of age to be prosecuted as an adult, varies within the United States.
2. Fully developed; mature.
Education for the foreign born came of age when bilingual education was accepted as a necessary part of the public school system.
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Source: A Dictionary of American Idioms
