Use the format “aged [age] years”

aged 9 years

Use the format “aged [age] to [age] years”.

aged 9 to 10 years

Include the months or weeks for ages under a year.

aged 9 weeks

If you refer to ages as “[age]-year-old”, include the hyphens.

16- to 24-year-old men

Write decades as an age as numerals.

women in their 40s

Bottom limits for age restrictions should use “aged [age] and over”. Don’t use the plus sign.

aged 75 and over