old enough
- matureFully grown or developed
- grownReached full size
- adultMature person, legally responsible
- readySuitable for use now
- legalPermitted by statute
eighteen · twenty-one · coming-of-age · permission · consent · responsible · independent · eligible · qualified · milestone · birthday · license · vote · drink · drive · age · threshold · puberty
maturity/readiness
old enoughnot ready
Lacking sufficient preparation
unprepared · wet behind the ears · unready · inexperienced · green