малоле́тство

nouninanimateuncountablevery rarely used (#21174)

1.
infancy, early childhood, childhood
С малоле́тства он мечта́л о море.
Since early childhood he had dreamed of the sea.
Somewhat bookish or old-fashioned; usually in the phrase «с малолетства» = since early childhood.
2.
minority, nonage, being under agelaw
По малоле́тству он не подлежи́т наказа́нию.
Because he is under age he cannot be punished.
Legal term; often «по малолетству» = on account of being under age.

Examples

С малолетства мальчик увлекался музыкой.
The boy had been interested in music from an early age.
В малолетстве она была очень болезненной.
She was very sickly in her childhood.
Он провёл всё малолетство в деревне.
He spent all his early childhood in the countryside.