They were all completely bilingual in Manx and English by the age of six.

BBC: Manx: Bringing a language back from the dead

For that to have been achieved he should have had surgery by the age of six.

BBC: Al-Amin is 10, and lives in a tiny village in Bangladesh.

Of the 150 children studied, 28% had developed asthma by the time they were between six and eight years of age.

BBC: Parenting link to asthma

Professor GERALDINE DAWSON (Director, Autism Center, University of Washington): When we think about the brain systems that are involved in autism that are responsible for things like eye contact or interest in other people or the development of language, these are brain systems that come on in the first year of life, certainly by six to seven months of age.

NPR: Researchers Set Sights on Early Autism Diagnosis

In 1963, at the age of forty-six, he made up for it by setting up his own informal school in a London railway station, teaching half a dozen teenagers in exchange for a little tobacco or a second-hand art book.

FORBES: The Ultimate In Reality TV? Try Televised Art Forgery. [Book Excerpt #2]