1. What is the best age for pregnancy? The best age for pregnancy is when a woman’s body is at the most suitable stage for childbearing to ensure the health of mother and child and the success rate of childbirth. This age varies from person to person, but is usually between 20-35 years old. 2. Why is 20-35 years old the best age for pregnancy? 1. Reproductive organs are well developed: At this age, female reproductive organs have been fully developed and pregnancy is easy. 2. Good physical condition: Women aged 20-35 are in the best physical condition, with strong immunity and high metabolic rate.