The mental capacity of a person to make reasonable contracts, is the only criterion, by which to determine his legal capacity to make obligatory contracts. And his mental capacity to make reasonable contracts is certainly not to be determined by the fact that he is, or is not, twenty-one years of age.
Lysander Spooner (1886). “A Letter to Grover Cleveland on His False Inaugural Address, the Usurpation and Crimes of Lawmakers and Judges, and Consequent Poverty, Ignorance, and Servitude of the People”
