In March 1946, scientists recorded the birth of almost every British baby born in one, cold week. They have been following thousands of them ever since, in what has become the longest running major study of human development in the world. These people – who turn 70 over the next two weeks − are some of the best studied people on the planet. And the analysis of them was so successful that researchers repeated the exercise, starting to follow thousands of babies born in 1958, 1970, the early 1990s and at the turn of the millennium. Altogether, more than 70,000 people across five generations have been enrolled in these “birth cohort” studies.

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