diff --git a/glance/cmd/manage.py b/glance/cmd/manage.py
index 6bff4e30b8..16e08c52e1 100644
--- a/glance/cmd/manage.py
+++ b/glance/cmd/manage.py
@@ -157,8 +157,8 @@ class DbCommands(object):
             sys.exit(_("Invalid int value for max_rows: "
                        "%(max_rows)s") % {'max_rows': max_rows})
 
-        if age_in_days <= 0:
-            sys.exit(_("Must supply a positive, non-zero value for age."))
+        if age_in_days < 0:
+            sys.exit(_("Must supply a non-negative value for age."))
         if age_in_days >= (int(time.time()) / 86400):
             sys.exit(_("Maximal age is count of days since epoch."))
         if max_rows < 1:
diff --git a/glance/tests/unit/test_glance_manage.py b/glance/tests/unit/test_glance_manage.py
index e7f958c7a2..7f28aadecc 100644
--- a/glance/tests/unit/test_glance_manage.py
+++ b/glance/tests/unit/test_glance_manage.py
@@ -36,8 +36,8 @@ class DBCommandsTestCase(test_utils.BaseTestCase):
     @mock.patch.object(context, 'get_admin_context')
     def test_purge_command(self, mock_context, mock_db_purge):
         mock_context.return_value = self.context
-        self.commands.purge(1, 100)
-        mock_db_purge.assert_called_once_with(self.context, 1, 100)
+        self.commands.purge(0, 100)
+        mock_db_purge.assert_called_once_with(self.context, 0, 100)
 
     def test_purge_command_negative_rows(self):
         exit = self.assertRaises(SystemExit, self.commands.purge, 1, -1)
@@ -50,6 +50,10 @@ class DBCommandsTestCase(test_utils.BaseTestCase):
                     "%(age_in_days)s") % {'age_in_days': age_in_days}
         self.assertEqual(expected, ex.code)
 
+    def test_purge_negative_age_in_days(self):
+        ex = self.assertRaises(SystemExit, self.commands.purge, '-1')
+        self.assertEqual("Must supply a non-negative value for age.", ex.code)
+
     def test_purge_invalid_max_rows(self):
         max_rows = 'abcd'
         ex = self.assertRaises(SystemExit, self.commands.purge, 1, max_rows)