2.276 exact age

When you want to talk about a person's exact age, you can do so by using

* 'be' followed by a number, and sometimes with 'years old' after the number

• I was nineteen, and he was twenty-one.
• I'm only 63.
• Harold was nearly twenty-four.
• She is twenty-five years old.
• I am forty years old.

* 'of' (and less commonly 'aged') and a number after a noun

• ...a child of six.
• ...two little boys aged about nine and eleven.

* a compound adjective, usually hyphenated, and consisting of a number, followed by a singular noun referring to a period of time, followed by 'old'

• ...a twenty-two-year-old student.
• ...a five-month-old baby.
• ...Mr Watt's rattling, ten-year-old car.
• ...a violation of a six-year-old agreement.

* a compound noun consisting of a number followed by '-year-old'

• The servant was a pale little fourteen-year-old who looked hardly more than ten.
• All the six-year-olds are taught by one teacher.
• ...Melvin Kalkhoven, a tall, thin thirty-five-year-old.