The two youngest people on the list of the most generous Americans in 2013 also gave more to charity than anyone else, according to a report released Monday by the Chronicle of Philanthropy.

Facebook founder Mark Zuckerberg and his wife, physician Priscilla Chan, gave $992.2 million to the Silicon Valley Community Foundation in Mountain View.

That marked the first time than anyone under the age of 30 led the list, the Chronicle said. Zuckerberg is 29 years old and Chan is 28.

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But a generational shift to younger donors hasn't materialized. Only seven on the list were younger than 50. The median age of the group was 72½.

The list of 50 top donors included individuals and couples. All told, the list consists of 69 people, 10 of whom had passed away.

California was especially well represented with 15 donors on the list. That was more than any other state. New York was second with 12 of the top donors, and Texas was third with five.

More gifts from the top 50 went to California charities and causes than to those in any other state.

Colleges and universities were among the most common recipients of large donations, with 30 receiving gifts of $1 million or more.

Next on the list of those that received donations of at least $1 million were foundations (14) and hospitals and medical centers (six).

Combined, the 50 biggest U.S. donors gave away about $7.7 billion in 2013, which was 4% more than in the previous year.

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