"Colds are most prevalent among children, and seem to be related to their increased contact with other children in schools and day care centers, or their relative lack of resistance to infection.

"Children have about six to ten colds a year on average, but in families with children in school, the number of colds per child can be as high as 12 a year."
- Common Cold, Overview

"Women, especially those aged 20 to 30 years, have more colds than men, possibly because of more close contact with children. Adults average about two to four colds per year, although the range varies widely.

"On average, individuals older than 60 have fewer than one cold a year."
- Common Cold, Overview