A young couple in 1960s at the Trincas Sunday Jam session. | Anand Puri Each wall of the 99-year-old Trincas, a Kolkata icon, resonates with history. There are photos of prominent patrons, popular entertainers who have performed here and Park Street scenes from decades ago.But Trincas does not just serve up a flavour of the past. For many in Kolkata, the first visit to Trincas is a coming-of-age experience. It is an induction into excess – of good food, good music, perhaps the first sip of liquor.As the famed establishment gears up to celebrate its centenary in 2027, Anand Puri,…