Middle age is the heyday of life. When people reach middle age, they are fully mature, strong, experienced and energetic. Middle age is also the mature stage of interpersonal relationships. Middle-aged people can look at reality rationally and comprehensively, have mature personality characteristics and stable code of conduct, and are deeply respected and dependent by society.

In the elderly, we can clearly feel that their health is failing, because their various abilities are shown, that is, the elderly, when they are old, their abilities will decline.