"I have seen with my own eyes the Sibyl hanging in a jar at Cumæ, and when the young men asked her what she herself most desired [assuming Sibyls were victims of desire], she answered, “I want to die.” - ΑΠΟΘΑΝΕΙΝ ΘΕΛΩ
It was she who guided Æneas through Hades in Virgil's Æneid, because Cumæ is in Italy, not Greece.
She had been granted immortality by Apollo
(whose own oracle at Delphi proclaimed the famous words Γνῶθι σεαυτόν),
but because she forgot to ask the god for perpetual youth,
she shrank into withered old age and (according to Pausanias) her authority declined.
How many millions of humans have echoed her undying wish ?