Dramatic increases in longevity and health coincided with rising and more evenly distributed prosperity.

NEWYORKER: Evening the Odds

This demographic challenge should come as no real surprise, even allowing for unexpectedly rapid increases in longevity.

ECONOMIST: Pensions

Many workers haven't gotten cost-of-living raises since the contracts lapsed, although some get increases linked to longevity or acquiring new credentials.

WSJ: Contracts a question as NYC mayor presents budget

Furthermore, as longevity of the population increases, these basic behaviors powerfully influence whether the added years are burdened by disability and illness.

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This means that further increases beyond 67 will not, as the government has previously suggested, be automatic if longevity rises.

BBC: State pension age to be reviewed every five years