persons. One under the age of twenty-one years. Considerable changes of the common law have probably taken place in many of the states. 6. Contracts made with him, may be enforced or avoided by him on his coming of age. See Parties to contracts; Voidable. But to this general rule there is an exception; he cannot avoid contracts for necessaries, because these are for his benefit. See Necessaries. The privilege of avoiding a contract on account of infancy, is strictly personal to the infant, and no one can take advantage of it but himself. 3 Green, 343; 2 Brev. 438. When the contract has been performed, and it is such as he would be compellable by law to perform, it will be good and bind him. Co. Litt. 172 a. And all the acts of an infant, which do not touch his interest, but take effect from an authority which he has been trusted to execute, are binding. The protection which the law gives an infant is to operate as a shield to him, to protect him from improvident contracts, but not as a sword to do injury to others. An infant is therefore responsible for his torts, as, for slander, trespass, and the like; but he cannot be made responsible in an action ex delicto, where the cause arose on a contract. . 8. He is also punishable for a crime, if of sufficient discretion.