育龄 literally combines 育 (yù), meaning 'to raise' or 'to give birth to', and 龄 (líng), meaning 'age' or 'years of age'. Together, 育龄 refers specifically to the period in a person’s life when they are biologically capable of bearing or fathering children — typically defined as ages 15 to 49 for women in public health contexts. It is a formal, technical term used widely in demography, reproductive health policy, and medical discussions.

This word is gender-neutral in form but most frequently applied to women in official statistics and guidelines. It appears in phrases like 育龄妇女 (women of childbearing age) or 育龄人口 (population of childbearing age). Unlike colloquial terms such as 'reproductive years', 育龄 carries an institutional, data-driven connotation and is rarely used in casual conversation.