Old enough to be required to register to be called to do battle in our common defense,
Old enough to enter into a marriage, suffer a divorce and pay alimony, or (better) raise and love a passel of kids into responsible, productive Citizens;
Old enough to sign a mortgage or lease and be held fully responsible for that, and to be fully bound by one's words and deeds;
Is old enough to merit the privelege of a beer at the end of a days work,
And certainly old enough to be needful of the means to defend onself and one's family. Indeed, it is part of one's adult responsibility to do so.