from datetime import date

def calculate_age(born):
    today = date.today()
    return today.year - born.year - ((today.month, today.day) < (born.month, born.day))

dob = date(2004, 12, 31)
age = calculate_age(dob)
class Student:
    def __init__(self, classOf, name):
        self.classOf = classOf
        self.age = age
        
    @property
    def classOf(self):
        return self.classOf
    @classOf.setter
    def classOf(self, classOf):
        self.classOf = classOf
        
    @property
    def age(self):
        return self.age
    
    @property
    def name(self):
        return self.name
    @name.setter
    def name(self, name):
        self.name = name
        

stu = Student(classOf=2025, name="Paaras")
users = [stu]

json_string = json.dumps([vars(user) for user in users]) 
print(json_string)