Supporting youth during their transition from childhood to adulthood is a critical investment in our collective future. Public spending on programs and services for youth is an important indicator of the degree to which our society prioritizes this important responsibility. Between 1990 and 2000, the population of 6 to 18 year olds, those who are now between the ages of 12 to 24, increased 12.8%. Investments in Illinois' Future analyzes Illinois expenditures on programs and services for youth ages 12 to 24 between fiscal years 1994 and 2004. This historical analysis yielded the following key findings that provide valuable information and context to inform future planning, policy development, appropriations decisions, and statewide analysis impacting youth in Illinois.