legal age

noun
the age at which a person acquires full legal rights and responsibilities, such as the right to make contracts and deeds.

Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To legal age
Example sentences
Washed up and penniless before they are of legal age.
In my opinion, lifting the retirement legal age is obviously a necessity for
  the future.
Her conscience and sense of responsibility don't spontaneously form at the
  legal age of adulthood.
Merely adjusting the legal age up or down doesn't work-we've tried that already
  and failed.
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