Kimani Ng'ang'a from Kenya , aged 85 , is the world's oldest school pupil. He has arrived in New York this week to speak at the United Nations about the of free primary education. Kimani started school last year, when the Kenyan government free primary education. He didn't go to school as a child because his family couldn't pay the .

Kimani has been very successful at school . Although he is only in his second year he has a lot since he started. He gives other pupils tips and . His teacher is very pleased with him. Kimani, who couldn't even hold a pen when he started can now even write a few words of Swahili.

Among his favourite are maths and science. He says English is very difficult to learn but he will keep up trying.

Kenya used to be a British colony , and in the 1950s, Kimani fought for with the Mau Mau rebels. He wants to learn maths to count his money, he says. He also wants to learn to read the Bible. "You are never too old to learn", he told reporters.

Recently , Kimani has achieved a place in the Guinness Book of Records as the world's oldest primary school pupil. He has 30 great-grandchildren. Two of them are in the same school as him , but they are in higher years. Kimani waited a long time for the first day at school, but he never gave and he finally . He wants to tell world leaders that all children should be able to go to school. "To me, freedom means going to school and learning," he told reporters. But he has other plans for his visit to New York too. "I would also like to a rich American woman," he said.