หัวหน้าที่แสดงมีอายุเท่าไร?
What are the distinct ages of the heads who are acting?
head_df = pd.DataFrame(columns=['age', 'head_id']); management_df = pd.DataFrame(columns=['head_id', 'temporary_acting'])
head_df[head_df['head_id'].isin(management_df[management_df['temporary_acting'] == 'Yes']['head_id'])]['age'].unique()