टाइमगैप के साथ आयु जोड़ना

# Reference date
reference_date = datetime.date(____, ____, ____)

# Add age to the basetable
basetable["age"] = (pd.Series([calculate_age(____, ____)
                              for date_of_birth in basetable["date_of_birth"]]))

# Calculate mean age
print(round(basetable["____"].____()))