In the application problem of finding age, the age difference is mainly used to calculate. For example, Xiaoming is 5 years old and his mother is 29 years old. In a few years, her mother will be five times as old as Xiao Ming. (29-5)/(5- 1)=6 years old (when I was 6 years old, my mother was five times as old as Xiao Ming; 1 year later, my mother's age is five times that of Xiaoming. Because of the age difference, I am older than Xiao Ming, so "I will reduce 1". It is five times bigger than Xiao Ming, but only four times bigger than Xiao Ming.