This read-only field reports how many seconds have elapsed since a specific station FFT entry was first inserted into the cache. An administrator uses this to judge how long-lived a particular cached forwarding entry is, which can help distinguish long-running flows from recently established ones. For example, a very low rlInetFftStnAge value for an entry that should be long-established could suggest the entry was recently re-learned after having aged out or been flushed.