Sentence:  The students are growing and developing at an astonishing rate mentally, physically, and morally. They are no longer children nor have they reached the <WSD>age of judgment</WSD> and discretion, but are in the period of transition, of vital and tremendous change. 
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