After Everest, Jordan, 13, plans to climb Mount Vinson

Last Saturday, a 13-year-old boy from California became the youngest person to reach the summit of the world's highest mountain. Jordan Romero phoned his mother from the peak of Mount Everest.

"Mom, I'm calling you from the top of the world," Leigh Anne Drake told the BBC. He was climbing with his father and three Sherpa guides. One of the guides, Apa Sherpa, 50, was climbing Everest for the 20th time, breaking his own record.

Some mountaineers have criticized the Romero family for letting their teenage son climb Mount Everest, but the boy's father said the ascent from the Chinese side is "safe".

Jordan Romero climbed Africa's Mount Kilimanjaro aged 10. Within two years he had scaled Elbrus, Aconcagua and Denali. All he needs to do now is summit Mount Vinson (4,897 metres) in Antarctica and he'll have climbed the highest mountain on each of the seven continents. He intends to do it in December, he says.