How long should we live? As long as we can? Japan boasts the world’s longest life expectancy — 83 years, 20 years longer than 60 years ago. Longevity is like prosperity: It seems an unalloyed good but on closer examination turns out not to be. Prosperity’s downsides include environmental degradation, stress and clinical depression. Longevity spawns dementia, infirmity, loneliness and a demographic imbalance favoring the very old at the expense of the young, with all the grim economic consequences that implies.

No social reformers talk seriously of limiting either prosperity or longevity. If they are good, more must be better. Their attendant problems are acknowledged but considered soluble. Clean technology will heal the environment. Wise legislation will generate saner working conditions. Medical advances will cure dementia.

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