One picture can hold most of this word: a boy standing a step to the side, waiting to be needed. He carries, he fetches, he takes a message across the house. He is dressed for the place he serves in, and his whole job is to be near someone else and useful to them. Move that boy from a great house to a hotel, or to a wedding, and you have the other uses.
The supplied source entry gives the word as page + boy. Page already names a young attendant, and boy pins the age, so the compound says, quite literally, a boy who attends on someone.
這份資料裡的來源條目說，pageboy 就是 page 加 boy。page 本來就指在人身邊伺候的年輕人，boy 再把年紀點明。合起來字面上就是「一個負責伺候的男孩」，和上面那個畫面完全對得上。
Wiktionary entry supplied in this packet (source_ref kaikki:3f6f69a190036ae4:1421687750:16702): 'From page + boy.'
From the picture
髮型：髮尾內彎的短髮
這個用法和上面的男孩共用同一個字，可以拿「男童頭」的畫面來幫助記憶。不過這份資料並沒有說這個髮型真的是從侍童的頭髮來的，所以只當成聯想，不要當作字源。要記的是形狀本身：髮尾往內收的那條平順線條。
noun · C1
A hairstyle for straight hair, in which the hair hangs down to about the chin or the shoulders and the ends are curled under, so that they turn in towards the neck. In this style the hair is often cut shorter at the front than at the back.
髮尾內彎的短髮
noun · C1
A boy who serves as a page: a young servant or attendant in the household of a king, queen, or noble family, who waits on them and carries their messages. The source marks this use as now frequently historical, so you meet it mostly in history and in stories set in the past.
侍童
noun · B2
In British English, a young boy who takes part in a wedding as an attendant to the bride, walking with her and helping her during the ceremony. He is usually small — the source gives about five to ten years old.
婚禮上的男童
noun · C1
A young man employed in a hotel, club, or similar place to take messages to guests, carry their bags, and do other small jobs for them. The source marks this word for the job as old-fashioned.
旅館的服務小弟