With the decrease of the legal age for marriage, the marriage time is advanced, so that more people have the opportunity to have children, thus increasing the fertility rate.

2. It can also be seen from practice that lowering the legal age for marriage can increase the fertility rate.

For example, in some areas, the legal age of marriage was reduced from 20 to 18, and it was found that the fertility rate in this area increased significantly.

Second, the feasibility of lowering the legal age for marriage:

1. Lowering the legal age for marriage can increase the fertility rate, but it may also bring some social problems.

First of all, the physical and mental development of teenagers is not yet fully mature. Teenagers of marriageable age have no responsibility for marriage and child-rearing, and there may be more family conflicts.

Secondly, lowering the legal age of marriage may harm women's health and development, because early marriage will affect women's physical and mental development, thus damaging women's education and employment.

2. While lowering the legal age for marriage, effective measures should be taken to protect the health and development of teenagers.

For example, by strengthening ideological education for students and guiding them to correctly understand marriage, the government can provide more capital investment to give young people more opportunities to participate in various development activities and promote their development.