I believe Guardians are basically immortal, unless they get killed, in which case, they're reborn through the Galaxy Cauldron.
Only if their Star Seeds/Sailor Crystals themselves remain undestroyed.
Yes, that remains a possibility, hence why I said "basically" immortal.
Maybe we're having a slight miscommunication, sorry about that.
I'm just curious about the cats' lifespans compared to the guardians rather than the civilians of Crystal Tokyo. They have Diana who is by Chibi-Usa's side, ~871 years in the future, so I'm guessing Luna (and Artemis) was literally
close to Usagi's age while placed into stasis by Queen Serenity, and lived out the rest of her 1,000 years in Crystal Tokyo like it's average civilians?