juvenility

The state or quality of being juvenile.

The plant grew from juvenility to maturity in a week.

Next in juvenility to Abraham came two more girls, Hope and Modesty; then a boy of three, and then the baby, who had just completed his first year.

Juvenile behavior, writing, etc.

The frantic fanaticism of this paragraph deprives us of all hope that Mr. Irving will, as we once fondly hoped, outgrow his juvenilities.