In defence of τανηλεγής (as < tanw-, not a reanalysis of τ᾽ ἀνηλεγής), Ο. Szemerényi, Syncope in Greek and Indo-European and the Nature of the Indo-European Accent (Naples: Istituto Universitario Orientale di Napoli, 1964), 159, cited τανήλοφος 'long-necked' (Hesychius) whose age is unfortunately unknown. The latter adjective is in LSJ, but is not found by the TLG and is not a lemma in any edition of Hesychius to which I have access.
UPDATE (09/08/2016): LSJ also has an entry for δανήλοφα: '= μακροτράχηλα or ὑψηλοτράχηλα, (i.e. ταν-).', in which 'Id.' refers to H(e)s(y)ch(ius) in the preceding entry.
The full entry in Hesychius reads as follows:
δανήλοφα· μακροτράχηλα, ἐκτεταμένους ἔχοντα τοὺς λόφους.
ἢ ὑψηλοτράχηλα, μετεώρους ἔχοντα τοὺς λόφους. ἢ πίονας<.>
On the subject of Homer and Hesychius, note the following entry in the latter:
ναύποδα· μακρόποδα <ι 464, etc.>. Od.9.464 has τὰ μῆλα ταναύποδα and LSJ comments '(false division of ταναύποδα)'.
Note also Hesychius' entry for σπελλάμεναι· στειλάμεναι. LSJ, reasonably, indicates that the former is Aeolic (σπ-, -ελλ-, -μεναι).