@addressable(Exactly(int))
    def age(self):
Returns a subset of the queryset containing observations where one of
dataset/ETHPy150Open pantsbuild/pants/tests/python/pants_test/engine/exp/test_addressable.py/AddressableTest.Person.age--crossover with--dataset/ETHPy150Open ExCiteS/geokey/geokey/contributions/managers.py/ObservationQuerySet.search