从DateTime(出生日期)开始的年龄

from datetime import datetime

def get_current_datetime():
    return datetime.now()

def get_birth_datetime(birth_date):
    return datetime.strptime(birth_date, '%Y-%m-%d')

def calculate_age(birth_date):
    current_datetime = get_current_datetime()
    birth_datetime = get_birth_datetime(birth_date)
    age = current_datetime.year - birth_datetime.year - ((current_datetime.month, current_datetime.day) < (birth_datetime.month, birth_datetime.day))
    return age

birth_date = "1990-04-15"
age = calculate_age(birth_date)
print("Age:", age)