How many years does spring grass last every year?

12 years old or older. The complete expression of spring grass age is that you are healthy every year, and spring grass age is that you can be healthy every year. May your life be good every day, the weather be good every day and the spring grass be evergreen. It is a good wish for each other and a healthy life for each other, because when you are below 12, you don't particularly understand the expression of poetry or couplets. So we can't understand the meaning of this blessing, but when 12 years old, we can understand the meaning contained in the blessing method and our wishes to ourselves through knowledge learning, so it is generally used when 12 years old.