def METHOD_NAME(self, to=None) -> str:
    if self.created_at is None:
        return 'N/A'
    to = to or datetime.datetime.now()
    delta = relativedelta(to, self.created_at)
    date_attrs = ('years', 'months', 'days', 'hours', 'minutes', 'seconds')
    for attr in date_attrs:
        if getattr(delta, attr) > 1:
            return f'~{getattr(delta, attr)} {attr}'
        elif getattr(delta, attr) == 1:
            return f'~{getattr(delta, attr)} {attr[:-1]}'