- 1). Write figures for the ages of people and animals. For example, The boy is 4 years old. The dog is 2 years old. If the age is an adjective before a noun, use a hyphen. The 4-year-old boy wants his mother. My 2-year old dog ate my homework.
- 2). Write figures for objects. For example, the chair is 8 years old.
- 3). Write out an age when it starts a sentence. For example, Nine-year-old girls love to swim.
- 4). Write the age as a word if it's under nine when writing about a century. If the age is greater than nine, use a figure. Unless it's a proper name, also lowercase the word "century." For example, the event took place in the ninth century. The event took place in the 18th century.
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