India skipper Virat Kohli thanked his first captain Mahendra Singh Dhoni for all the lessons as the superstar wicketkeeper-batsman announced retirement from all forms of international cricket on Saturday. Thanks for everything. I tip my hat to you,” Kohli wrote on Twitter. One of the greatest to have ever played the game, Mahendra Singh Dhoni, has announced his retirement from international cricket. With the former India skipper hanging up his boots aged 39, a glorious chapter in Indian cricket has ended. In a career spanning almost 16 years, Dhoni achieved some extraordinary feats as a leader and a player.