People turning 29 and 39 and 49 are measurably more likely to run a marathon or make a large life change — the nine-enders effect

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Why does money make people act differently? Why do people break rules they agree with? Why does time seem to speed up as you get older? Robert Butler's 1963 paper on the life review reframed old-age reminiscence as developmental work rather than decline Retirees gain hours and report less leisure than expected Blanchflower and Oswald's U-shaped happiness curve bottoms out around 47 though later studies dispute whether it holds everywhere Erikson's eighth stage is integrity versus despair — the task of making sense of a whole life at the end of it The arithmetic of the tail end: if you see your parents twice a year you may have fewer than forty visits left The end of history illusion: people at every age believe they have finally stopped changing Palliative nurse Bronnie Ware's most common deathbed regret was not having lived true to oneself rather than having worked less