Bailly
δεκα·ετής, ής, ές :
1 âgé de dix ans, HDT.
1, 114 ; HPC.
Epid. 1, 947 ; 2 qui dure dix ans, THC.
5, 25, 26.
Étym. δ. ἔτος.
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LSJ
ές, or δεκαέτης, ες, ten years old, Hdt. 1.114, Hp. Epid. 1.10.
of or lasting ten years, πόλεμος Th. 5.25, 26 codd., Jul. Or. 2.74b. (Cf. δεκέτης.) — The statements of Gramm. as to the accentuation of this and similar words are confused, cf. Poll. 1.54, EM 765.21, Choerob. in Theod. 1.167, 2.385; they were prob. parox. in Attic, oxyt. in the κοινή.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ές, zehnjährig ; πόλεμος, Thuc. 5.25. – Bei Her. 1.114 δεκαέτης παῖς.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)