I turn 56 in a week, and I’ve been thinking about how life changes with age. I’ve come up with a view expressed in terms of two key distinctions: Foregame vs. Endgame Actions in games often have both direct local immediate consequences, and also more indirect global delayed consequences, such as those that result from how other players react to your actions, then more others react to those actions, and so on. The longer a game that stretches ahead, and the more other players who interact, the more that these indirect consequences can matter. In contrast, at the end of a game there are fewer moves others make after you, and fewer other players that your moves might influence. So endgame play focuses more on direct local immediate consequences. Cooperation often breaks down in endgames, as it often depends on threats of future and wider reprisals against uncooperative behaviors.