when did he start his career?
At the age of eight.
Sebastian Shaw (actor)
Shaw made his acting debut at age eight on the London stage as one of the juvenile band in "The Cockyolly Bird" at the 
who played anakin skywalker in return of the jedi Sebastian Lewis Shaw. where is he from? Norfolk.
wiki:19060039
Sebastian Shaw (actor) [SEP] Early career
Shaw made his acting debut at age eight on the London stage as one of the juvenile band in "The Cockyolly Bird" at the Royal Court Theatre in Chelsea on New Year's Day of 1914. During his time at Gresham's, he also played Petruchio in "The Taming of the Shrew", his first of many performances from the works of William Shakespeare; schoolmate W. H. Auden, who would go on to become a highly regarded poet, portrayed Katherina in the play opposite him. After Gresham's, Shaw planned to become a painter and spent two years at the Slade School of Fine Art before switching his interests to acting; regarding the change, his father informed him, "I wondered when you would come to your senses." He earned a scholarship to the Royal Academy of Dramatic Art in Bloomsbury, London.