The term "reproductive years" refers to the period in a person's life when they are capable of having children. This typically begins around puberty and continues until menopause, which is usually defined as occurring between ages 45-55. During these years, a woman's body produces eggs regularly (usually once per month) and her hormones are in balance to support the possibility of pregnancy. The phrase "one's reproductive years" specifically refers to the time period during which an individual is capable of conceiving children.