Ralph - 12 years old…one of the older boys on the island. The main protagonist of the novel; 

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Jack -   One of the older boys and about Ralph's age (12). He is the leader of the choir boys.

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Piggy -  Piggy is slightly younger than Ralph. 

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Simon - one of the "in-between" boys, not as old as Ralph, but also not a littlun'

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Sam and Eric (or "Samneric") - Twins, always together

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Roger - Another "in between" who serves as Jack's "lieutenant."

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Littluns - the small boys on the island, assumed to be around 5 years old.

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