Bankers and financiers are not exactly the most popular members of our society these days. By contrast, young tech tycoons seem to be enjoying their moment as America's economic heroes.

Yet according to a new analysis, people who made their money in technology and software account for less than a quarter of those who have taken the Giving Pledge. Only two of the signers are under 35.

America’s top billionaire philanthropists, it turns out, are those bankers and investors. And most of them are over 65 years old.

The Giving Pledge, launched by Warren Buffett and Bill Gates in 2010, has 81 billionaire signers so far, each of whom have pledged to give away at least half of their wealth.

“The average age in this group is trending higher, more toward seniors,” said Bradford Smith, president of the Foundation Center, which has launched " Eye on the Giving Pledge " to research and analyze pledge givers and their causes. “Banking and finance is the most common industry where they made their wealth.”

“Eye on the Giving Pledge" tracks the billionaires who have signed the pledge and looks at how they made, and give away, their fortunes.

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