FEBRUARY 3, 2009 Emarketer Safe assumption: Teens are online.Unsafe: Retirees aren’t. About nine out of 10 US consumers ages 12 to 24 use the Internet. That is not surprising. But more than one-half of those ages 65 to 69 are online as well, and Internet-using 70-to-74-year-olds make up 45% of people that age, according to […]...