What does it mean for children to sing the song "Bless you" to their elders?

I wish the elders good health. The song "Bless You" was originally a song to bless the health of the elders, and it will be sung to them every birthday. "Fu" is a standard first-class word (commonly used word) in modern Chinese, which first appeared in the Bronze Age of Shang Dynasty and belongs to the pictophonetic character of Six Books. The basic meaning of "blessing" is that everything goes well and is auspicious, as opposed to "disaster", such as blessing and enjoying happiness, and its extended meaning is the gesture of women saluting in the old society, such as hail.