Slowing down Time by Einstein's theory of Relativity: Live Long

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We can slow down time and can live long, Do you know Einstiens' theory of Relativity, If we travel faster than light, then the time is slowed down, In Space , the time is very slow. For Example: Father's age : 30 Son's age : 5 After Fifty years: Son's age: 55 Father's age would be lesser than the son's age if he was in space for fifty years,But I dont know how it works, I am not a physicist , I am only a Student, I want to know your opinions whether it would be true.