diff --git a/ryu/ofproto/ofproto_v1_0.py b/ryu/ofproto/ofproto_v1_0.py
index 624bc76f..2a390677 100644
--- a/ryu/ofproto/ofproto_v1_0.py
+++ b/ryu/ofproto/ofproto_v1_0.py
@@ -575,6 +575,7 @@ NXT_FLOW_REMOVED = 14
 NXT_FLOW_MOD_TABLE_ID = 15
 NXT_SET_PACKET_IN_FORMAT = 16
 NXT_PACKET_IN = 17
+NXT_FLOW_AGE = 18
 NXT_SET_CONTROLLER_ID = 20
 
 # enum nx_role
diff --git a/ryu/ofproto/ofproto_v1_0_parser.py b/ryu/ofproto/ofproto_v1_0_parser.py
index f16fff94..f71dd14a 100644
--- a/ryu/ofproto/ofproto_v1_0_parser.py
+++ b/ryu/ofproto/ofproto_v1_0_parser.py
@@ -1401,6 +1401,15 @@ class NXTPacketIn(NiciraHeader):
                    cookie, match_len, match, frame)
 
 
+class NXTFlowAge(NiciraHeader):
+    def __init__(self, datapath):
+        super(NXTFlowAge, self).__init__(
+            datapath, ofproto_v1_0.NXT_FLOW_AGE)
+
+    def _serialize_body(self):
+        self.serialize_header()
+
+
 class NXTSetControllerId(NiciraHeader):
     def __init__(self, datapath, controller_id):
         super(NXTSetControllerId, self).__init__(