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
Find the average age and experience working length of journalists working on different role type.
[Schema (values) (types)]: | news_report |  event : event_id (text) , date (number) , venue (text) , name (text) , event_attendance (text) | journalist : journalist_id (text) , name (number) , nationality (text) , age (text) , years_working (text) | news_report : journalist_id (text) , event_id (number) , work_type (text);