Question: Thanks!  Now can you add to that list the student capacity of each of those dormitories?
SQL: SELECT avg ( T1.age )  ,  T3.dorm_name, T3.student_capacity FROM student AS T1 JOIN lives_in AS T2 ON T1.stuid   =   T2.stuid JOIN dorm AS T3 ON T3.dormid   =   T2.dormid GROUP BY T3.dorm_name