The old ‘uns are getting online. Nielsen//NetRatings reports (PDF file) that senior citizens age 65 and older were the fastest growing age group online, surging 25 percent year over year in October 2003.Nielsen//NetRatings also found that in addition to outpacing senior males in audience growth, the rise in usage by female seniors was greater than the increase in usage by senior males, if you get my drift. “As a whole, the Internet audience is continuing to become more representative of the general population,” said Greg Bloom, senior Internet analyst, Nielsen//NetRatings.