Python Pandas -如何使用键的存在来过滤包含字典的列的数据帧？

import pandas as pd

data = {'name': ['Alice', 'Bob', 'Charlie', 'David'],
        'info': [{'age': 25, 'gender': 'female'},
                 {'age': 30, 'gender': 'male'},
                 {'age': 35, 'gender': 'male'},
                 {'age': 40}]}

df = pd.DataFrame(data)

filtered_df = df[df['info'].apply(lambda x: 'age' in x.keys())]