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Will 2020 be a battle between 70-somethings?

(CNN) If the 2020 election were held today, the two most likely Democratic nominees against President Donald Trump are Joe Biden and Bernie Sanders.

A face-off between Trump and Biden would pit a 74-year-old against a 77-year-old. A race between Trump and Sanders would be a 74-year-old facing off against a 79-year-old.

That prospect is something that 6 in 10 Americans are OK with, according to new Gallup polling. While that might seem high-ish, it's actually pretty low when you compare it to the other traits Gallup asked about. In fact, only a socialist candidate (47% would support) and an atheist candidate (60%) score lower than those who would vote for a candidate over 70. (More than 7 in 10 said they would have no problem voting for someone under 40 for president.)

That's an intriguing finding, given that Trump is a near-certainty to appear in next year's general election, while, if you are a betting man (or woman), you would put your money, today at least, on either Sanders or Biden.

Sure, 60-ish percent of people will be fine with such a choice. But that leaves a whole lot of people less comfortable with choosing between two septuagenarians for the highest office in the country.

Do Democratic voters consider that possibility when selecting their nominee? Does the 37-year-old Pete Buttigieg or even the 54-year-old Kamala Harris get a bit of a boost for their relative youth?

The Point: It's not clear whether Democrats will want to choose a candidate diametrically opposed to Trump in every way -- or one who draws sharp contrasts on some fronts but not on others.

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