He is one among very few Indians to race in the International arena and in Formula championships. He has also been abroad for various races, including Germany and Malaysia. He drove in the 2003 Formula Asia BMW Championships. He raced in the 2010 Formula 2 Championship along with two other Indians, Armaan Ebrahim and Parthiva Sureshwaren. After a one-off race during the Formula Maruti Indian Championships in 2002, where he finished in fourth place, Ajith signed a contract with manager Akbar Ebrahim, confirming his participation in the inaugural Formula BMW Asia championship. Despite spinning out in the first lap of his first race, Ajith successfully completed the season by finishing twelfth. After a six-year sabbatical, Ajith signed up for his third season of car racing by participating in the 2010 season of the FIA Formula Two Championship. The decision to be involved in the sport was made after Ajith's film directed by Gautham Menon was delayed, allowing him to participate in the whole season. Prior to signing up, he competed in the final round of the MRF racing series in Chennai in February 2010, but failed to finish the race due to mechanical problems. Further trials in Sepang, Malaysia followed suit as he practised for the season's beginning in April 2010 in his Formula Renault V6 car with Eurasian Racing, shedding 11 kilograms during training. Media reports that Ajith has dated actresses Swathi and Heera Rajagopal. In 1999, during the shoot of Saran's "Amarkalam", Ajith began to date his co-star Shalini At that time, their involvement made him a regular subject of tabloid gossip. Despite the fact actor Ramesh kanna advised Ajith not to marry an actress, Ajith proposed to actress Shalini in June 1999 and they were married in April 2000 in Chennai. On 3 January 2008, their daughter, Anoushka, was born in Chennai. On 2 March 2015, their second child, a son Aadvik was born. Through his marriage to actress Shalini, he became brother-in-law to actor Richard Rishi and actress Shamili, who appeared as his sister-in-law in Rajiv Menon's "Kandukondain Kandukondain".