I believe he is 17, or somewhere around that age.
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There isn't anyone in the book A Separate Peace named Edwar "Leper."
There is only a guy named Elwin "Leper" and he is 17 years old.
In the book A Separate Peace, Leper Lepellier suffers a nervous breakdown from which he does not fully recover from after enlisting in boot camp.
Leper's real name in "A Separate Peace" is Elwin Lepellier. He is one of Gene's classmates at the Devon School.