She is twelve years old.

she Pronoun

— A ship or a machine such as a car. She is one of the largest ships you can ever find in this port. I bought this car 5 years ago, but she is still working well.

she Noun

— A she refers to a female. Alice is definitely a she.

is Verb

— A form of the verb be when talking about someone or something else. He is late for class. Is it hot in here?

twelve Determiner

— (ordinal twelfth) Twelve is the number that is after eleven and before thirteen. In numerals, it is 12. Twelve eggs make a big omelette.

twelve Noun

— The number 12. and ten makes twelve. — A set of twelve things or persons. The twelve are never alone. — To be twelve years old. This girl is twelve.

years

— noun (= old age, age, eld, geezerhood) a late time of life old age is not for sissies he's showing his years age hasn't slowed him down at all a beard white with eld on the brink of geezerhood — noun (= age) a prolonged period of time we've known each other for ages I haven't been there for years and years — noun (= days) the time during which someone's life continues the monarch's last days in his final years

old Adjective

— If someone or something is old, they are not young; they have been in existence for a long time. An old man has gray hair. — How old someone is, is their age. "Ashley, how old are you?" "I'm only 16 years old."