[21] Works on Old Age are said to have been written by Theophrastus and Demetrius Phalereus, either or both of which Cicero might have used. One passage in § [67], facilius in morbos ... tristius curantur, is supposed by many to have been imitated from Hippocrates; but the resemblance is probably accidental. Cf. De Off. 1, 24, 83.
[23] See Att. 16, 11, 3; 16, 3, 1; 14, 21, 3.
[25] As Cicero's intention was to set old age in a favorable light, he slights Aristo Cius for giving to Tithonus the chief part in a dialogue on old age. See § [3]; cf. also Laelius, § 4.
[26] See below [(ii.), 1.]
[27] On the whole subject of Aristotle's dialogues see Bernays' monograph, Die Dialoge des Aristoteles.
[28] § [32] quartum ago annum et octogesimum. Cf. Lael. 11 memini Catonem ante quam est mortuus mecum et cum Scipione disserere etc.
[29] Cicero always indicates this date; cf. § [14]. Some other writers, as Livy, give, probably wrongly, an earlier date.