text: from django.contrib import admin
  from django.contrib.auth.admin import UserAdmin
  from .forms import CustomUserCreationForm
  from .forms import CustomUserChangeForm
  from .models import CustomUser
  
  
  class CustomUserAdmin(UserAdmin):
      add_form = CustomUserCreationForm
      form = CustomUserChangeForm
      model = CustomUser
      list_display = [
          'email',
          'username',
          'age',
          'is_staff',
      ]
      fieldsets = UserAdmin.fieldsets + ((None, {'fields': ('age', )}), )
      add_fieldsets = UserAdmin.add_fieldsets + ((None, {'fields': ('age', )}), )
  
  
  admin.site.register(CustomUser, CustomUserAdmin)
  