Different ages. According to the query of Baiyi Publishing Network, the National Natural Science Foundation of China will issue an annual project initiation notice every year, which will determine the project initiation time and announce it in the first half or the middle of each year, while the actual start time of the project is decided by the applicant himself. It takes some time for the applicant to make a detailed research plan, recruit team members, acquire experimental equipment and prepare experimental materials. , so the actual start time of the project will be later than the start time of the project, or even postponed to the next year.