His twinkling eyes, sprightly steps and lean frame are no indicator of his age; the mostly-white beard is a slight giveaway. After all, he began working at the age of 21 in 1968. But the contrast between the 50-something president of National Association of Software and Service Companies (Nasscom), Kiran Karnik, and his predecessor, the late Dewang Mehta, is striking. If Mehta was flamboyant, Karnik prefers a low profile. If Mehta was larger-than-life in Nasscom