Parental nurturing is backfiring, and as a result a generation of teens is growing up less independent, less skilled at common tasks - from doing laundry to choosing college classes - and increasingly unprepared for adulthood, studies show. Even young adults often are highly reliant on their parents; more than 60 percent of 23-year-olds and 30 percent of 25-year olds are still financially supported by their parents.