@property
def age_column(self):
    '\n        Must be set by subclasses.\n\n        This is used to specify the column in the result table of\n        ``._create_query()`` which is holding the age in days.\n        '
    raise NotImplementedError
Must be set by subclasses.

This is used to specify the column in the result table of
``._create_query()`` which is holding the age in days.
@property
def age_column(self):
    '\n        Must be set by subclasses.\n\n        This is used to specify the column in the result table of\n        ``._create_query()`` which is holding the age in days.\n        '
    raise NotImplementedError