Wikipedia has come of age and is the first place to look for information.
Come-of-age Sentence Examples
Soon after he had come of age he disposed of his property, and in 1593 went to Flanders and enlisted in the Spanish army, assisting at the capture of Calais by the Spanish in 1596 and gaining some military reputation.
By the time he came of age, his other six brothers had not only come of age but also had each adopted a continent of responsibility.
They had grown up during the difficult 1960s and had now come of age in the even-more-fraught 1970s and so now more than ever, the music and look that went with it spoke to them.
Star Wars is your classic movie of the 70s that had someone ordinary come of age through extraordinary circumstances.