Life's happiness path = who cares? > grumpy > I can't be bothered?

Is happiness is 'U-shaped'? Are the middle-aged more grumpy? The Telegraph reports on research by

Mr van Landeghem to be will presented at the Royal Economic Society annual conference at Royal Holloway, the University of London, this week. It suggests that happiness follows a U-shaped curve during a person's lifetime, according to research showing that middle-aged people are the unhappiest.