SMU alumnus Aaron Tan is the co-founder of Carro, a unicorn start-up dealing in used cars. Carro topped The Straits Times and Statista's list of Singapore's fastest-growing companies last year. It was also No. 1 in the Nikkei Asia and Financial Times' Asia-Pacific list of high-growth companies last year. Aaron shared about his growing up years, how he started his first business at the age of 13 before eventually starting Carro.