5.15 Age

Exact age is usually indicated in numerals, even if less than 10:

  • Jane, aged 9, and her brother Tom, 10, led the hike.

It is written out, however, in the case of approximate age and in formal contexts:

  • He’s eighty if he’s a day.
  • She was no more than seventeen at the time.
  • On the occasion of her retirement at the age of sixty-five.