People become happier with age, survey finds

Maybe it's the Alzheimer's or dementia...

"Happiness increases along with age, according to findings from a three-decade-long U.S. survey released on Wednesday.

Between 15 percent and 33 percent of 18-year-old Americans were likely to say they were very happy, with women happier than men and whites happier than blacks, based on findings from the survey conducted between 1972 and 2004.

The older people got, the more likely they were to report being happy, with slightly more than half of respondents in their 80s saying they were very happy."

And they simply forgot how miserable they are.