muttonhood
/ˈmʌtənʊd/Definitions
1. noun
The state or period of being in a state of immature or childish development, often in a way that is perceived as foolish or silly.
“The group’s antics in muttonhood were a source of amusement for the community.”
2. noun
A period of time in which someone is prone to making foolish or silly decisions.
“After his muttonhood, he became more mature and responsible.”