Why do you like to give birthday presents to pine-aged cranes?

The ancients used cranes as fairy birds to prolong life; Pine is a long-lived tree with long green leaves. Legend has it that taking turpentine can make you live forever, and the gods can turn you into a crane. There is a saying that "the Millennium crane leans on the Millennium pine". In the tradition of China, cranes and pine trees are often used to form the pattern of "Longevity at Pine Age", which means longevity. So birthday is a long life, especially for the elderly.