Python - Помогите! Программа спрашивает у пользователя денек, месяц и год

from datetime import datetime, date

print("Your date of birth (dd mm yyyy)")   05 03 1900

date_of_birth = datetime.strptime(input("---gt;"), "%d %m %Y")

def calculate_age(born):

   today = date.today()

   return today.year - born.year - ((today.month, today.day) lt; (born.month, born.day))

age = calculate_age(date_of_birth)

print(age)