Come of age and Settle down

Come of age verb - Reach a certain age that marks a transition to maturity.

Settle down and come of age are semantically related in mature topic. In some cases you can use "Settle down" instead a verb phrase "Come of age", when it comes to topics like fully grown.

Settle down verb - To become still and orderly.

Come of age and settle down are semantically related in mature topic. You can use "Come of age" instead a verb "Settle down", if it concerns topics such as fully grown.