This read-write object reports the number of seconds since a given route entry was last updated or otherwise confirmed correct. An admin should interpret this carefully, since the MIB explicitly notes that no universal meaning of too old applies without also knowing the specific routing protocol, given in clnpRouteProto, that produced the route. For example, a route age of 600 seconds might be perfectly normal for a slowly converging protocol but would be a red flag for one expected to refresh routes every few seconds.