With the development of society, modern couples are planning for childbirth later and later. However, age is an important factor that affects fertility. The best age for women to have children is 25-29 years old, after 30 years old women’s fertility starts to decline, after 35 years old it plummets, and after 40 years old women gradually enter the perimenopausal stage and few have successful pregnancies. In IVF treatment, we also find that younger women, with better ovarian function and sensitivity to drugs, can obtain more eggs and have better egg quality as well as good quality of embryos formed, and have a better chance of successful pregnancy. Younger women should not neglect to take it lightly, the age of the ovaries is also very important. Some women are very young, but their ovaries have already begun to decay, and in their 20s they are already the equivalent of 40 years old and nearly menopausal, making treatment of this type of infertility more difficult. The chance of pregnancy is higher within the first year of consultation, and when comparing different years of treatment in the same age group, the pregnancy rate is the highest within the first year of treatment, about 65%, after which the pregnancy rate decreases year by year and the spontaneous abortion rate increases year by year. the abortion rate is 14% at the age of 25, and rises to 44.5% when older than 35, and up to 50% for women aged 45. For men, age is also closely related to sperm quality and the health of the baby. 25-35 year old men have the best sperm quality, and after 40 years old, sperm quality gradually decreases. There is an increase in chromosomal disorders in men with increasing age, and the risk of having a child with malformations increases by a factor of 1 if the father is over 40 years old.