Final answer:
The risk factors for ovarian cancer peak in a woman's 40s.
Step-by-step explanation:
The risk factors for ovarian cancer peak when a woman is in her 40s. According to the information provided, female fertility peaks in the 20s and starts declining in the 30s. Menopause, the end of the menstrual cycle, typically occurs around 50 years old. This aligns with the peak risk for ovarian cancer happening in the 40s.