Age play is the term for consenting adults who roleplay in some way pertaining to age. Sometimes this is "infantilism", which is adults acting as babies. There are all ages.. this can also include schoolgirl or schoolboy with headmaster or headmistress, and every conceivable age in between. Consensuality is key, and let me stress again this is ADULTS - it has nothing whatsoever to do with anyone under the age of consenting adult.

A person who gets sexually aroused by Dating someone older than them who takes a role of a caregiver or dom

Also an Ageplayer is a person who acts a younger age than their normal to please the dom or caregiver and be totally submissive to them