What are the distinct ages of the heads who are acting?
SELECT DISTINCT T1.age FROM management AS T2 JOIN head AS T1 ON T1.head_id  =  T2.head_id WHERE T2.temporary_acting  =  'Yes'
SELECT DISTINCT T1.age FROM management AS T2 JOIN head AS T1 ON T1.head_id  =  T2.head_id WHERE T2.temporary_acting  =  'Yes'
[{'age': 53.0}, {'age': 52.0}, {'age': 69.0}]