I've wondered a few times if Exoristos from Demon Knights is still around or returned to Themyscira. (I never finished the title so I don't know what her status is.)
Hessia and Myrina seemed longer-lived despite not being on the island. I didn't read Odyssey of the Amazons, so I'm not sure if Hessia returned to Themyscira before showing up again in Superman/Wonder Woman.
I tend to think of the Amazons as immortal or at least long-lived versus mortals, regardless of whether or not they leave the island. Diana especially so, given her current demigod status and lineage.