In 1964 two writers set out to understand the new "teenager".
They called their subjects: Generation X and the ground-breaking book they produced was a first in pop sociology.
Within its pages was the voice of Britain's newly disaffected youth, from aristocrats in blazers, to bikers in leather.
The evangelical Christian Dr Billy Graham declared that Generation X was proof of the cataclysmic moral decline of the young.
40 years on, Generation X are close to retirement.
Alan Dein tracks down the original participants and finds out how their lives have changed.