With a win in November, John McCain would become the oldest first-term president ever, and to combat doubts about his age — when asked in February of this year, a quarter of registered voters (26%) said they think he is too old to be president, and this proportion rises to nearly a third (32%) when voters are informed that he is currently 71 years old — his campaign has decided to make his medical records available. While the vast majority (72%) say they do not think McCain is too old to be president, a February 2007 Pew survey found that about half of Americans (48%) say they would be less likely to vote for a candidate in their 70s.

The Daily Number is a statistic, updated every weekday and typically drawn from Pew Research Center project findings, that highlights an important trend.

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