Error Creating New User with a Custom Django User Model Including 'age' Field

I'm new to Django and trying to set up a custom user model with an additional 'age' field. I've configured my project to use the custom model (accounts.CustomUser) and created corresponding forms and admin registration. However, after running makemigrations for the accounts app and migrating, I encounter an error when creating a new user. My setup is as follows:

config/settings.py:

PYTHONCopied
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'accounts',
]

AUTH_USER_MODEL = 'accounts.CustomUser'

accounts/models.py

PYTHONCopied
from django.db import models
from django.contrib.auth.models import AbstractUser

class CustomUser(AbstractUser):
    age = models.PositiveIntegerField(null=True, blank=True)

accounts/form.py

PYTHONCopied
from django.contrib.auth.forms import UserCreationForm, UserChangeForm
from .models import CustomUser

class CustomUserCreationFrom(UserCreationForm):
    class Meta:
        model = CustomUser
        fields = UserCreationForm.Meta.fields + ('age', )

class CustomUserChangeForm(UserChangeForm):
    class Meta(UserChangeForm.Meta):
        model = CustomUser
        fields = UserChangeForm.Meta.fields

accounts/admin.py:

PYTHONCopied
from django.contrib import admin
from django.contrib.auth.admin import UserAdmin

from .models import CustomUser
from .forms import CustomUserChangeForm, CustomUserCreationFrom

class CustomUserAdmin(UserAdmin):
    add_form = CustomUserCreationFrom
    form = CustomUserChangeForm
    model = CustomUser
    list_display = ['username', 'email', 'age', 'is_staff']
    fieldsets = UserAdmin.fieldsets + (
        (
            None,
            {'fields': ('age', )},
        ),
    )
    add_fieldsets = UserAdmin.add_fieldsets + (
        (
            None,
            {'fields': ('age', )},
        ),
    )

admin.site.register(CustomUser, CustomUserAdmin)

Django version: Django==5.1.4
App name: accounts

I'm looking for guidance on what might be causing this error during user creation and how to fix it.