They may waste hours playing video games now, but Gen Y has big plans for the future. Roughly 64 percent of 16-to-19-year-olds in a new survey by researchers Nickles & Ashcraft and Greenfield Online believe their goals in life are quite ambitious. Just one-third of boomers share the same go-get-'em attitude. But aren't teens, no matter what the generation, more optimistic about life than their elders? Not so, the researchers contend. Since 1979, Nickles & Ashcraft has seen the percentage of 20-to-24-year-old females with ambitious plans jump 11 percent. It's been a different story with females aged 35 to 50. The number of women in that group who claim to have high goals has declined 16 percent in the last 20 years.