At what age did Oscar die? And how did he die?
The answer to your first question is not specifically stated in the novel, but it can be deduced by observing the chapter titles as well as their content. The first chapter is entitled "GhettoNerd at the End of the World 1974-1987" and reveals Wao's "Golden Age" which was when he was seven years old. Wao was, therefore, born in 1967. Furthermore, the sixth chapter is entitled "Land of the Lost 1992-1995" and ends right before Wao travels back to Santo Domingo...
(The entire section contains 261 words.)
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i think it is pretty safe to assume he was simply shot, since his last word was "fire"