This needs to be considered, if only because it is not based on an obvious calculation: if it has any basis in fact, we must take it, at least, that he was under 60 when he died, whenever that was. Among modern arguments, the most important is from his strategia in 424, best in the form which Ste up gave it (introduction, pp. iii-iv), viz. that he could not speak as he does of Alkibiades in 420 when he was on the point of election(5.43.2), or as he allows Nikias to speak in 415 (6.12.2), if he himself had been elected at Alkibiades' age or younger. This would mean that he was well over 30 in 424, say about 35; which might be reconcilable with Marcellinus so long as we do not extend his life long beyond 404.