她比我年轻怎么说用英语

To say that someone is younger than you in Engpsh, you can use the phrase "She is younger than me." For example, you might say "She is younger than me, but she is very mature for her age." or "She is four years younger than me, but we get along really well." You could also use the word "younger" as an adjective, as in "She is a younger woman than me," or "She is the younger of the two of us."