import datetime


def prompt_user():
    name = input('What is your name? ')
    try:
        age = int(input('How old are you? '))
    except ValueError:
        return 'Age must be a number.'

    return 'Hello {0}! You were born in {1}.'.format(name, get_year() - age)


def get_year():
    now = datetime.datetime.now()
    return now.year


if __name__ == '__main__':
    print(prompt_user())