The speakers in my main rig are going on 13 years now and they would be the Alon Lotus mk ll's with AlNiCo tweeter upgrades. I've gone thru 2 woofer rebuilds but since they're the 14 ohm option woofers that is something that must be rebuilt and not just replaced as they are no longer available. Absolutely no reason I can think of to upgrade. Yes I hear all the newest offerings from high end speaker manufacturers but none really match the ultimate musicality, resolution and soundstaging of the Lotus'. I also have a REL Stadium lll augmenting them so it's a true full range system but the Alon's totally disappear as sound sources and let the music speak.
How old are your speakers
I am wondering how many listen to old speakers. I am not looking so much as to how long you owned them but how old are they. Are they your primary speakers? I am listening to a pair of 2003 Verity Parsifal Encores and continue to be pretty pleased with them.