How to talk about age?
The word "age" can be a noun. In this case, it means "the number of years someone has lived or something has existed". (LDOCE)
In English, we talk about age in two ways; in question and in answering someone's question.
Asking someone's age
When we question, we ask about someone's age "how old are they?". To do this, we use (how + old + be + subject). In this case we can ask:
How old am I?
How old are you?
How old is he?
How old is she?
How old is it?
How old are we?
How old are you?
How old are they?
How old is John?
How old are Simon and Jane?
Answering Questions
To answer the question, there are two possibilities.
One is:
subject + be + number.
Another possibility is:
subject + be + number + year/years + old.
In the first case we say:
I am twenty, or I am 20, (in writing).
In the second one, we say:
He is fifteen years old, or he is 15 years old (in writing).
Mor examples
I am fifteen, or I am 15.
Their baby is one, or their baby is 1, or you can say: Their baby's just one year old.
My grandfather was eighty, when he passed away. We can write: my grandfather was 80.
Read more
"At the age of seven, a young boy and his family were forced out of their home. The boy had to work to support his family. At the age of nine, his mother passed away. When he grew up, the young man was keen to go to law school, but had no education.
At 22, he lost his job as a store clerk. At 23, he ran for state legislature and lost. The same year, he went into business. It failed, leaving him with a debt that took him 17 years to repay. At 27, he had a nervous breakdown.
Two years later, he tried for the post of speaker in his state legislature. He lost. At 31, he was defeated in his attempt to become an elector. By 35, he had been defeated twice while running for Congress. Finally, he did manage to secure a brief term in Congress, but at 39 he lost his re-election bid.
At 41, his four-year-old son died. At 42, he was rejected as a prospective land officer. At 45, he ran for the Senate and lost. Two years later, he lost the vice presidential nomination. At 49, he ran for Senate and lost again.
At 51, he was elected the President of the United States of America.
The man in question: Abraham Lincoln."
– Author Unknown