How to get access to model B which is inherited from A?

Question

Django

There is a model A:

class ModelA(models.Model):
   name = models.CharField()

There is model B:

class ModelB(ModelA):
   age = models.IntegerField()

Tell me how to access the fields of ModelB, referring to the object through ModelA, for example: Provided that I cannot edit model A, i.e. change its properties. Thank you.
age = ModelA.objects.get(id=1).age

Answer 1

ModelA.objects.get(id=1).modelb.age