a form of role-play
often an element of bdsm
play, age play is most often used
to refer to both 'adult babies' and adolescent role exploration.
Adult-babies involve people who take an infant role, with another adult taking a
caretaker or parent role. Reportedly this form of roleplay can be quite amusing in an S&M-oriented dungeon.
More frequently ageplay is roleplay usually involving adolescent roles / fantasies, such as catholic school girls or Daddy-boy relationships. Often
this is a means of visiting or accessing issues from that time.
Neither of these activities is related to pedophilia. Ageplay (or something like
it) is a common element of 'accepted' societal humor and roleplay, In addition to
being a common element of alternate sexuality / relationship or leathersex.