Although Sibyl did live an extended life as Apollo had promised, he did not give her agelessness along with it, so she shrivelled and shrank and only her voice remained.
ɔːlðˈoʊ sˈɪbɪl dˈɪd lˈɪv ɐn ɛkstˈɛndᵻd lˈaɪf æz ɐpˈɑːloʊ hæd pɹˈɑːmɪst, hiː dɪdnˌɑːt ɡˈɪv hɜːɹ ˈeɪdʒləsnəs ɐlˈɔŋ wɪð ɪt, sˌoʊ ʃiː ʃɹˈɪvəld ænd ʃɹˈæŋk ænd ˈoʊnli hɜː vˈɔɪs ɹᵻmˈeɪnd.