def calculate_age(born, alive, death):
    today = date.today()
    today = datetime.now()
    age_in_years = today.year - born.year - ((today.month, today.day) < (born.month, born.day))
    months = (today.month - born.month - (today.day < born.day)) %12
    age = today - born
    if alive == 'No':
        age_in_years1 = death.year - born.year - ((death.month, death.day) < (born.month, born.day))
        months = (death.month - born.month - (death.day < born.day)) %12
        age = death - born
        return age_in_years1
    else:
        return age_in_years

df['age'] = df['birthdate'].apply(calculate_age,args = (df.alive, df.death))

ValueError                                Traceback (most recent call last)
<ipython-input-61-bde1cb6c3981> in <module>()
----> 1 df['age'] = df['birthdate'].apply(calculate_age,args = (df.alive, df.death))
                                                                                            ^
    ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().