Fresh as he is from a triumphant duel with a combatant three decades younger, it doesn’t take much to establish that Ratan Tata, chairman emeritus of Tata Sons and still leonine at 79, is as active in retirement as he was at the helm of affairs. Those were 21 fairly epoch-making years steering one of India’s largest and most diversified conglomerates, with interests spanning from tea to steel, automobile and airlines.