Youth originally refers to which season of the four seasons youth means.

1, youth originally refers to the spring of the four seasons, because spring plants are lush and green, which is the lush period, so it is called youth.

2. Spring is the first season in a year, and there are many ways to divide the four seasons. In daily life, people usually regard the arrival of beginning of spring solar terms as beginning of spring, and beginning of spring is defined from the perspective of astronomy.

In spring, the northern hemisphere of the earth began to tilt towards the sun, and more and more sunlight was directed, so the temperature began to rise. As the ice and snow melt, the water level of the river rises. In spring, plants begin to sprout and grow, and many flowers bloom. Hibernating animals wake up, many animals with eggs for the winter hatch, and birds begin to migrate, leaving the wintering ground for breeding grounds. Many animals are in estrus during this period, so China also calls spring the season of "the revival of everything". The changes of temperature and biology in spring also affect people's psychology and physiology.