noun
1
BAD : I'm at the age of 22.
GOOD : I'm 22 (years old).
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be + NUMBER (+ years old ): 'David is almost twelve (years old).'
2
BAD : His age is about fifty-five years old.
GOOD : He's about fifty-five (years old).
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Do not use age and years old together. The usual way of mentioning someone's age is simply be + NUMBER: 'She'll be sixteen next August.'
3
BAD : Soon you'll be of my age.
GOOD : Soon you'll be my age.
BAD : Although we are at the same age, we have different interests.
GOOD : Although we are the same age, we have different interests.
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be my/your etc age : 'When I was your age, I was already going out to work.'
be the same age (as sb) : 'Most of my friends are the same age as me.'
4
BAD : In the age of 15, you are allowed to drive a car.
GOOD : At the age of 15, you are allowed to drive a car.
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Phrases with age as their main word usually begin with at (NOT in ): 'Keeping fit is very important at your age.' 'Some girls get married at a very young age.' 'She is at the age when she wants to go to school.'
5
BAD : A child in the age of seven or eight needs a little push.
GOOD : A child of seven or eight needs a little push.
BAD : People in my age spend a lot of time in pubs.
GOOD : People of my age spend a lot of time in pubs.
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noun + of + NUMBER: 'They have a little girl of three and a boy of five.'
noun + of + my/your etc age : 'He is very clever for a boy of his age.' 'A girl of her age needs someone to play with.'
Note the alternative with aged : 'A child aged seven or eight needs a little push.'
6
BAD : They have two children in the age of 8 and 12 years.
GOOD : They have two children aged 8 and 12.
GOOD : They have two children, 8 and 12 years of age.
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When you mention two ages after a noun, use either of the following:
aged + NUMBER + and + NUMBER: 'two boys aged 12 and 14'
NUMBER + and + NUMBER + years of age : 'two boys, 12 and 14 years of age'.
7
BAD : These books are for children at the age of from 8 to 12 years.
GOOD : These books are for children aged 8 to 12.
GOOD : These books are for children between the ages of 8 and 12.
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When you mention an age range after a noun, use either aged + NUMBER + to + NUMBER: 'suitable for children aged seven to eleven' or between the ages of + NUMBER + and + NUMBER: 'suitable for children between the ages of seven and eleven'.
8
See MIDDLE AGE (↑ middle age )