Generally speaking, regardless of intelligence and spirit (that is, those who are mentally unsound, mentally retarded and so on). ), people who have reached the age of 18 are fully capable. Therefore, under the age of 18, the contract will take effect only if it is approved by the legal agent. However, there is one exception. For citizens who have reached the age of 16 and are under the age of 18, but whose main source of livelihood is their own labor income, the law can regard them as persons with full capacity for civil conduct. For example, some students work part-time as model actors or other part-time jobs, and these labor incomes can maintain the general living standards of local people. If they exceed 16 and fall below 18, the contract can also take effect.