MINYANVILLE ORIGINAL They say life begins at 40 but  four decades to the day after the Dow Average (^DJI) first topped 1 000 shares sank for a fifth session in six sliding to their lowest level since late June and are now down over 1 000 points since the recent peak.   One could claim markets acted not middle aged but instead like moody adolescents although that description does a disservice to teen clothing company Aéropostale (ARO) which climbed 2.22% on an otherwise dire day. Moreover the 13-19 age group are notorious for oversleeping in the morning only to party late. A charge that ...