Note 065
From Chapter 44 of the Decline & Fall

This controversy was likewise given for the Proculians, to supersede the indecency of a search, and to comply with the aphorism of Hippocrates, who was attached to the septenary number of two weeks of years, or 700 of days (Institut. l. i. tit. xxii.). Plutarch and the Stoics (de Placit. Philosoph. l. v. c. 24) assign a more natural reason. Fourteen years is the age — See the vestigia of the sects in Mascou, c. ix. p. 145 - 276.