A spokesman for Jordan Romero says the boy's team called by satellite phone from the summit of the world's highest peak on Saturday.
The previous record for the youngest climber to scale Everest had been held by Temba Tsheri of Nepal. He reached the peak at age 16.
Romero was climbing Everest with a team including his father and three Sherpa guides. He left for the peak from the base camp on the Chinese side of the mountain.
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Romero has been on a quest to climb the highest peaks on all seven continents.
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