The economy may be not be the best, but Americans are still optimistic. A new Harris Poll finds that the vast majority of the public is satisfied with their lives, and that most people believe that their personal situation will improve over the next five years, reports Humphrey Taylor, chairman of The Harris Poll, Harris Interactive. The numbers who feel this way are lower today than they were in the last few years, but most Americans are still upbeat and optimistic in spite of the economic tough times and the increase in unemployment, Taylor said. A majority of Echo Boomers (aged 18-30), and pluralities of Gen X (aged 31-42) and Baby Boomers feel their present situation today is better than it was five years ago, Taylor said. Only among Matures (aged 62-plus) is there a significant number who feels that their situation has become worse. Some additional findings include: — Some 88 percent of all adults are satisfied with their lives, and 54 percent are very satisfied.