Anatolian languages from oldest to youngest; Hittite, Palaic, Luwian, Hiero Luwian, Lycian, Lydian.
Indic (“Indo-Aryan”) languages from oldest to youngest
Sanskrit: Vedic, transmitted orally from ca. 1200–1000 BCE; oldest written texts from the 2nd century CE; oldest written Indic texts (Prakrit) from the 3rd century BCE
Iranian languages from oldest to youngest; Avestan, Old Persian
Italic languages from oldest to youngest; Latin, Faliscan, Oscan, Umbrian, Venetic
Greek languages from oldest to youngest
Celtic, Continental Celtic languages from oldest to youngest; Gaulish, Lepontic, Celtiberian
Celtic, Insular Celtic languages from oldest to youngest
Germanic languages from oldest to youngest
Runic inscriptions from ca. 150 CE
Baltic languages from oldest to youngest
Slavic
Armenian
Attested from the 5th century CE
Tocharian
Tocharian A: 8th–9th century CE
Tocharian B: 6th–9th century CE
Albanian
Attested from the 15th century CE
Phrygian
Phrygian: Old Phrygian inscriptions from the 8th–4th century BCE; New Phrygian from the 2nd–3rd century CE
Messapian
Inscriptions from the 5th century BCE