Longevity Congratulation
In Western European countries, people are usually congratulate for some one on his longevity on his birthday. But in our country for a long time ago ( in past), most of before generation can not remember their date and month of birth exactly. So they are usually congratulated for their longevity on early of the spring, on Tet days, Spring days is also time every people have rest time, his children and grand-children focus.
in the traditional spirit, longevous person and his family have a great lucky and because of its he have had a long living and have fertile of children.
congratulation longevity is also congratulate that lucky.