The fourth edition of The Millennials: Americans Born 1977 to 1994 is two books in one-it provides a demographic and socioeconomic profile of the Millennial generation, which spanned the ages of 15 to 32 in 2009, and it includes a special supplement on the iGeneration, children under age 15. The two generations total 133 million people, or 44 percent of the total population. The Millennials: Americans Born 1977 to 1994 is designed for easy use. Its 11 chapters examine Millennials' Attitudes, Education, Health, Housing, Income, Labor Force, Living Arrangements, Population, Spending, Time Use, and Wealth, The additional nine chapters in the special iGeneration supplement examine children and their families: Education, Health, Housing, Income, Labor Force, Living Arrangements, Population, Spending, and Time Use. New to this edition is the Attitudes chapter, based on data from the 2008 General Social Survey. Also new are tables on the use of alternative medicine, population projections to 2025, and estimates of household wealth. The chapter on time use shows how young adults and parents prioritize their time.