As kids get older their reasons for deception change
Experts say when children are younger, lying is about avoiding punishment, while at an older age, it becomes about adapting socially with their peers or parents. 98% of teens say they have lied to their parents.
Darling, N., Cumsille, P., Caldwell, L., Dowdy, B. (2008, in press). Predictors of adolescents' disclosure strategies and perceptions of parental knowledge. Journal of Youth and Adolescence.