Adolescentilism

a form of erotic Roleplaying in which an individual acts or treats another as if they were a different age. Generally this can involve someone pretending to be younger than they actually are, but more rarely can involve assuming an older role. Variations include incest play, in which individuals recreate and sexualize roles with in a family, and Daddy's girl fetishism in which real or imagined age differences are the basis of the roleplaying and the female is portrayed as the younger partner