On February 29, 1992, Gu Jiong made the first noise in the global village in an ordinary delivery room of an ordinary hospital in an ordinary city.
I remember there was such a math problem when I was in first grade. February 29th is Xiao Ming's birthday. So how many birthdays has Xiao Ming had in 20xx?
In fact, this is not bad. When you get older, when someone asks you, old lady, how old you are, you can answer, 21!