A page or page boy is traditionally a young male attendant or servant, but may also have been a messenger in the service of a nobleman.
Lord Patten, robed as Chancellor of Oxford University, assisted by a page
Alof de Wignacourt and his page, by Caravaggio, c. 1608
The Queen and the Page, by Marianne Stokes, 1896
Painting of a page boy with slave collar, Dutch, 17th century
A page is an occupation in some professional capacity. Unlike traditional pages, who are normally younger males, these pages tend to be older and can be either male or female.
A group of legislative pages at the Ontario Legislative Building in Toronto, circa 1893.