Understanding Django Form Validation Pipeline and Custom Validators

from django import forms
from django.core.exceptions import ValidationError

class UserRegistrationForm(forms.Form):
    email = forms.EmailField()
    age = forms.IntegerField()
    
    def clean_age(self):
        age = self.cleaned_data.get('age')
        if age < 18:
            raise ValidationError('Age must be at least 18')
        return age
    
    def clean(self):
        cleaned_data = super().clean()
        email = cleaned_data.get('email')
        age = cleaned_data.get('age')
        if email and age and age > 65:
            raise ValidationError('Senior citizens cannot register')
        return cleaned_data

form = UserRegistrationForm(data={'email': 'hari@example.com', 'age': '70'})
print(form.is_valid())