Gynaecology & Obstetrics Gonadotropin levels decline to prepubertal levels by age A 6 month to 1 year of age B 1 year to 2 years of age C 2 years to 3 years of age D 3 years to 4 years of age. 💡 Explanation Gonadotropin levels decline to prepubertal levels by age ✓ Correct Answer: B. 1 year to 2 years of age