When you’re young and of a certain un-Eeyore sensibility, each day dawns pregnant with possibility, and once you’ve stretched out and shaken off whatever thickness might linger from the previous night’s indulgences, you can easily enough conjure the “Work hard, Play hard” mantra displayed on t-shirts and billboards, assuring you that all of life is there for the taking if you’re just bold and desirous enough to grab its lapels. Then you get older, and while you may still feel some or most of that pulse-quickening sense of open-endedness regarding the course of your dawning day, what is even more…