juvenileness

Example:The spirit of youthfulness was palpable at the school sports day, with students full of energy and enthusiasm.

Definition:The quality of being youthful; the character or condition of youth; marked by energy, freshness, and delight in life or excitement, especially as found in young people.

Example:Her youthful exuberance was infectious, making everyone around her feel more optimistic.

Definition:The quality or state of being a youth; the characteristic feelings or traits of young people, such as freshness, vigour, and naivety.

Example:The teenagers were full of energy and youthful vigor, causing many problems for parents and teachers.

Definition:The period of life between childhood and adulthood, marked by a certain degree of energy, impulsiveness, and impatience.