Сat the age of six, they (started / have started) their own production company, becoming the yongest hollywood producers in history. they (appeared / have appeared) in full house for eight years. the show finaly (ended / has finaly ended) in 1995. they (published / have published) their first book about twelve years ago: so far, their books (sold / have sold) more than 30 million copies and (make / have made) more than $130 million