"A good year must be remembered, especially orange and green" comes from Su Shi's To Liu Jingwen in Song Dynasty. The whole poem is: There is no rain in the lotus, and there are Ao Shuang branches in the chrysanthemum. You must remember the best scenery in a year, which is in the late autumn and early winter of orange and green.
It is used to describe that when a person reaches the prime of life, although his youth is gone, it is also the golden stage of maturity and great achievements in life. Encourage friends to cherish this great time, be optimistic and make unremitting efforts, never be depressed and never sell yourself short.