Which term is associated with youth or childhood?

The term "juvenile" is associated with youth or childhood as it specifically refers to individuals who are not yet adults, typically encompassing those in their formative years, from early childhood through adolescence. The term derives from the Latin word "juvenilis," which means youthful. It is commonly used in various contexts, including legal, educational, and psychological fields, to describe matters related to children and adolescents.

In contrast, the other terms refer to different age groups or stages. "Gerontological" pertains to the study of aging and the elderly, indicating a focus on older adults. "Adult" signifies someone who has reached maturity, thus not relating to youth or childhood. "Infantile," while it can describe something associated with infants or very young children, often carries connotations of immaturity and is not as broadly representative of the entire youth demographic as "juvenile" is.