You should always hyphenate numbers when you are describing compound numbers between 21 and 99 (except 30, 40, 50, 60, 70, 80 and 90). A compound number is any number that consists of two words; for example, eighty-eight, twenty-two, forty-nine. Numbers higher than 99 do not need a hyphen.

Do you hyphenate twenty two year old?

When to Hyphenate “Year Old”

If the answer is yes to these two questions, hyphenate. In the following examples, notice how the two conditions are met. The twenty-year-old vintage tasted much better than the twenty-five-year-old wine. Is the age a noun?

What is an example of a hyphen?

Use a hyphen to join two or more words that stand for a single adjective (describing word) before a noun. Examples: chocolate-covered donuts. well-known doctor.