In the six months since Microsoft (NSDQ: MSFT) launched Bing, the company’s share of the search market has inched up from 8 to 9.9 percent, according to comScore (NSDQ: SCOR). So, who are the converts? At the Credit Suisse Annual Technology Conference, Microsoft SVP Yusuf Mehdi said the company was having particular success winning over younger searchers. He said that with Bing Microsoft had improved its performance with the critical 18-to-24-year-old demographic, which he said makes up a disproportionate number of the search engine’s users. (Asked for specifics, a spokeswoman said that the percentage of 18-to-24 year-olds using Bing has been 20 percent greater than the number of 18-to-24 year-olds in the general population.) By contrast, Mehdi said that Live Search was “over-indexed” with the 65-year-old-plus age group.