Custom User model with additional fields

custom_user.py

# models.py (app registration)
from django.contrib.auth.models import AbstractUser
from django.db import models

class CoffeehouseUser(AbstractUser):
    age = models.IntegerField(blank=True,null=True)
    telephone = models.CharField(max_length=15,blank=True,null=True)
    #...

# admin.py (app registration)
from django.contrib import admin
from .models import CoffeehouseUser

class CoffeehouseUserAdmin(admin.ModelAdmin):
    pass

admin.site.register(CoffeehouseUser, CoffeehouseUserAdmin)

# settings.py
AUTH_USER_MODEL = '<model_path>'