First, the reason for setting the lower age limit.
Because some sports need intensive training and are unfriendly and inhuman to developing teenagers, it is easy to understand that the lower age limit is often set. For example, in gymnastics, the minimum age stipulated by the gymnastics organization is sixteen, and athletes under sixteen are certainly not allowed to participate in the Olympic gymnastics competition. Sixteen years old must include the training time required by athletes. After all, the Olympic Games is a great event in the world. Excellent athletes from all over the country will take part in the competition, which is a project to win glory for the country. Naturally, you need a lot of exercise time. For the sake of girls' physical development, it is more reasonable to set the age of participation at 16 or above. The lower age limit for diving is 14 years old, which is also due to the consideration of physical development. After all, these two projects need long-term intensive training.
Secondly, the reason for setting the upper age limit.
It is easy to understand that the lower age limit is set in consideration of the physical development of teenagers, but why should the upper age limit be set? I think one of the reasons is that with the increase of age, athletes' physical fitness begins to decline and their energy is not enough to support long-term high-intensity training. In addition, athletes have been injured more or less in years of high-intensity training, and the wounds on their backs have begun to affect their health. Even though many athletes can endure the pain caused by injuries for their dreams, their bodies can't support them to pursue their dreams. Strong physical training will lose their wives and soldiers, which will not only fail to realize their dreams, but also fail to achieve the expected results. As far as I know, the upper age limit of boxing used to be 34, but now it is relaxed to 40; And the national football team. Teams that are not allowed to participate in the competition have more than three players over the age of 23.