If you're asking about the oldest Musketeer it would be Athos.
It says so right in the description of Athos when d'Artagnan first sees him in Monsieur de Treville's office. d'Artagnan also meets Aramis and Porthos for the first time as well in this scene.
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The Three Musketeers fought for the King.
The director (1948) of The Three Musketeers was George Sidney.The director (2011) of The Three Musketeers was Paul W.S. Anderson.The director (1921) of The Three Musketeers was Fred NibloThe director (1933) of The Three Musketeers was Colbert Clark & Armand Schaefer.The director (1939) of The Three Musketeers was Allan Dwan.The director (1935) of The Three Musketeers was Rowland V. Lee.The director (1916) of The Three Musketeers was Charles Swickard.The director (1914) of The Three Musketeers was Charles V. Henkel.The director (2013) of The Three Musketeers has not been selected yet.
The Three Musketeers was written by Alexandre Dumas in 1844, the 19th Century.
There are three original Musketeers within the novel. Athos- who is the oldest of his three friends. Porthos- who is vain but he is very loyal to his friends. Aramis- who is a Musketeer but constantly thinks that he should become a priest. D'Artagnan is not a Musketeer in the book, instead it is about him becoming a Musketeer.
There are more than one edition of The Three Musketeers. The Createspace paperback published in 2014 has 398 pages.