Time flies, what does it mean to flash into middle age?

Time flies, to middle age, time flies, and then to middle age. According to China's national conditions, it is realistic for ordinary people to take 40 -55 years old as their middle age. This kind of people are often accompanied by the characteristics that knowledge is still accumulating and increasing, experience is increasingly rich, and human physiological functions are declining. When people reach middle age, their knowledge is still accumulating and increasing, and their experience is getting richer and richer, but their physiological functions are declining unconsciously. The continuous growth of psychological ability and the gradual decline of physical strength are the physical and mental characteristics of middle-aged people.