depends upon which old man you are talking about. There is Gandalf, Saruman or even Bilbo Baggins.
If you say man, I guess you mean human... for that would be Saruman as he didn't die or atleast he didn't in the movies, if he did die than it would be either Gandalf or the "Lost his name" Brown (he's a fellow wizard of Gendalf. (he only appears in the book")
If you are looking for the average being in middle earth it either be a elf (Elrond, but this might not be as accurate... because there are many elder elfs that are not being named within the movie or book.
So the only way to really find out is to talk to the author himself which unfortunally you can't do it anymore because he died on 2 September 1973(1973-09-02) (aged 81).
If it a creature it probs be the Dragon or the Ent for they are from the first age of middle earth.
hope this helps!
Old wise man Archetype
He is 111
The Lord of the Rings trilogy of films were filmed in New Zealand between 2001 and 2003 : The Lord of the Rings : The Fellowship of the Ring (2001) , The Lord of the Rings : The Two Towers (2002) and The Lord of the Rings : The Return of the King (2003) .
The books were first published in 1954. The Hobbit, the pre-quel to the book, was published in 1937. Professor Tolkien wrote The Lord of the Rings in the period in between.
"The Lord of the Rings: The Return of the King."
Bilbo is 111 years old in "The Lord of the Rings."
Old wise man Archetype
Frodo is around 53 years old when he dies in The Lord of the Rings.
The Lord of the Rings: The Two Towers .
Bilbo is 131 years old when he dies in "The Lord of the Rings" series.
Frodo is 50 years old when he leaves the Shire in "The Lord of the Rings."
Bilbo Baggins is 111 years old at the beginning of "The Lord of the Rings" series.
Bilbo Baggins is 50 years old in "The Hobbit" and 111 years old in "The Lord of the Rings" series.
He is 111
The Ringed Planet. Planet o' Rings. The Pretty Planet. Second Gas ball from the sun. The 6th Planet. Old Ringy. Old Sombrero Hat Man. The Ringer. Lord of the Rings.
Frodo was 50 years old when he left the Shire on his epic journey in "The Lord of the Rings" series.
Lord of the Rings: Return of the King.