The pursuit by adults of feelings which one associates with another - younger- age; using Roleplay, fantasy, or alternative lifestyles to create the dynamic of an older authority figure (Guardian) and an Innerkid which for many entails Emotionally Real Ageplay, in a relationship that is pseudo-parental, catering to the needs of the Innerkid as realistically as possible, as if she had a Biokid's emotional needs, for some combination of the therapeutic emotional experience, and the physical, sensory, or sexual fulfillment.

On Guardian Island, Innerkids are considered emotionally-real, and Adult Ageplay is about nurturing and guiding and protecting the Innerkid, as a biological parent does for a Biokid.