How old is Daniel Tammet?

Daniel Paul Tammet is an English writer and savant. His memoir, Born on a Blue Day (2006), is about his early life with Asperger syndrome and savant syndrome, and was named a "Best Book for Young Adults" in 2008 by the American Library Association's Young Adult Library Services magazine. Tammet's second book, Embracing the Wide Sky, was one of France's best-selling books of 2009. His third book, Thinking in Numbers, was published in 2012 by Hodder & Stoughton in the United Kingdom and in 2013 by Little, Brown and Company in the United States and Canada. Tammet's books have been published in over 20 languages.