Find the average age and experience working length of journalists working on different role type.
SELECT avg(t1.age) ,  avg(Years_working) ,  t2.work_type FROM journalist AS t1 JOIN news_report AS t2 ON t1.journalist_id  =  t2.journalist_id GROUP BY t2.work_type
SELECT avg(t1.age) ,  avg(Years_working) ,  t2.work_type FROM journalist AS t1 JOIN news_report AS t2 ON t1.journalist_id  =  t2.journalist_id GROUP BY t2.work_type
[{'avg(t1.age)': 43.0, 'avg(Years_working)': 16.5, 'Work_Type': 'Host'}, {'avg(t1.age)': 35.5, 'avg(Years_working)': 14.0, 'Work_Type': 'Music'}, {'avg(t1.age)': 30.333333333333332, 'avg(Years_working)': 4.666666666666667, 'Work_Type': 'Screening'}]