When a couple can marry according to the china's one child policy and discuss its consequences

The one-child policy in China was implemented in 1979 as a means of controlling the country's rapidly growing population. Under this policy, most couples were only allowed to have one child, although there were some exceptions, such as rural families being allowed to have a second child if their first child was a girl.

As a result of this policy, many couples were unable to marry until they had obtained permission to have a child. This led to delayed marriages for some couples, as they had to wait until they were able to have a child to get married. Additionally, the one-child policy also led to a gender imbalance in China, as many families preferred to have a male child and would sometimes abandon or abort female fetuses. This has resulted in a skewed sex ratio in the country, with more boys than girls being born.

There have also been concerns about the long-term consequences of the one-child policy, including the aging population and a shrinking workforce. In response to these issues, the Chinese government announced in 2015 that it would be relaxing the one-child policy, allowing all couples to have two children.

Overall, the one-child policy in China has had a significant impact on the country's population and society. While it was initially implemented as a way to control population growth, it has had lasting consequences that will continue to be felt for years to come.