Pythonic difference between two dates in years?

Question

Is there a more efficient way of doing this below? I want to have the difference in years between two dates as a single scalar. Any suggestions are welcome.

Answer 1

I use one of these to calculate person's age:

import datetime
dob = datetime.date(1980, 10, 10)

def age():
    today = datetime.date.today()
    years = today.year - dob.year
    if today.month < dob.month or (today.month == dob.month and today.day < dob.day):
        years -= 1
    return years

def age2():
    today = datetime.date.today()
    this_year_birthday = datetime.date(today.year, dob.month, dob.day)
    if this_year_birthday < today:
        years = today.year - dob.year
    else:
        years = today.year - dob.year - 1
    return years