(a person's) age

The original qipao covered most of a woman's body, revealing only the head, the hands and the tips of the toes, in order to conceal the figure of the wearer regardless of her age.

My sister is too young to go to school.

You're old enough to know better.

The ages of the two children put together was equivalent to that of their father.

The age of the universe is about 13.75 billion years.