Simon Cowell turns 65 this year, and he’s stacked a net worth of approximately $600 million over the course of his career. From an early age, Simon always knew he wanted to “have fun” with whatever vocation he took in life, but becoming a world-renowned music mogul may top any ideas he had as a youngster. This June, Simon Cowell sat down with Steven Bartlett on The Diary Of A CEO podcast. He explained some details about what life was like for him growing up. Between a “disciplinarian” mom and “strict teachers” Simon’s idea for a life outside the rat race was sparked early on. Simon ‘had a happ…