Mr Carranza, who began work in the mines at the age of ten, emerged on top of the pile.

ECONOMIST: Colombia

For this, people blamed a system which allotted pupils to schools on the basis of perceived ability at the age of ten.

ECONOMIST: Reforming education

Born in Pennsylvania and weaned in the South, he moved to Indiana at the age of ten before a scholarship took him off to Princeton.

ECONOMIST: Mitch Daniels

Born in Germany where his father was a cobbler, Theodore (usually known as Ted) Levitt (1925-2006) emigrated to the United States with his parents at the age of ten.

ECONOMIST: Guru

Why would any cautious parents allow their child to play youth tackle football at the tender age of nine, ten, or eleven years of age?

FORBES: Youth Football--Parents Gone Wild

Henry Grunfeld took over the chairmanship of the firm in 1964 and held it for ten years after which he formally retired at the age of 70.

ECONOMIST: Henry Grunfeld

Their father, Vere Bird senior, had dominated island politics from the 1930s until he retired ten years ago at the age of 84.

ECONOMIST: The end of a political era

Every year in the middle of January, at a shrine or before the houses of the community, five to ten women from age forty to eighty sing "a" "capella" to accompany the dancing of ten to twenty young girls in colourful kimonos.

UNESCO: Culture

Ten years ago I was in a transition, and starting college at the age of 38.

FORBES: Teresa Richardson: The 'Crochet Geek' Who's Hooked 60,000 YouTubers