At an age when most kids are ending their first year of high school, 15-year-old Jennifer Tilton of Florida is preparing to start MIT in the fall. Tilton started kindergarten when she was four and skipped first and fifth grades. She's now the valedictorian at Suncoast Community High School, and got perfect scores in math and physics on the SAT. "I can only evaluate from ages 0 to 15, but so far, I can say that I'm living a really happy life," Tilton said. "I never regret skipping grades."