她今年14岁可以说 "She is 14 years old this year." 或者 "She is 14 this year."
"She" 是主语，表示 "她"。 "Is" 是动词，表示 "是"。 "14 years old" 或 "14" 是表示年龄的形容词性短语。 "this year" 表示 "今年"。
例句：
"She is 14 years old this year." (她今年14岁)
"She is 14 this year." (她今年14岁)
"My sister is 14 this year." (我的姐姐今年14岁)
"I was 14 years old last year, but now I'm 15." (我去年14岁，现在我15岁了)