#!/usr/bin/env python3
# -*- coding: utf-8 -*-

__author__ = 'ipetrash'


from datetime import datetime


def get_age(text):
    date_text = text.split()[0]
    dt = datetime.strptime(date_text, '%d/%m/%Y')
    years_delta = datetime.today() - dt

    return int(years_delta.days / 365)


if __name__ == '__main__':
    text = '31/07/1972 (45 years old)'
    age = get_age(text)
    print(age)  # 45

    text = '18/08/1992'
    age = get_age(text)
    print(age)  # 25