Sentence:  The reason of the distinction between the contracts of minors under the age of 18 and the contracts of minors over 18 years is this, that a minor under the age of 18 is presumed not to have arrived at an <WSD>age of judgment</WSD> and discretion sufficient to protect him from the schemes of those who might take advantage of his infancy to defraud him ; and all persons who enter into a contract with a minor under the age of 18 must do so at the peril of having such a contract absolutely disowned and disaffirmed./  Civil Code, Section 35. 
Meaning of the word marked with <WSD> tags:  The age at which a child is presumed to be able to judge the difference between right and wrong