Over the next five years, the number of US baby boomers who use the Internet at least once a month will grow by more than 5 mln, rising from 58.2 mln in 2006 to 63.7 mln in 2011. Over-60s will also be a large and growing segment of the US Internet culture, growing from 17.7 mln Internet users in 2006 to 25.3 mln by 2011, Research and Markets says.