Krodjin
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I think the aging part is addressed with the "Timeless Body" class feature.
As for the sleep/eat/breathe thing... The Perfect Self says the Monk is treated as an Outsider for the purpose of spells and magical effects. I'm not sure that means the Monk assumes all of the normal "outsider" traits such as Darkvision or the ability to make eating & sleeping "optional". Even if they did, Outsiders still breathe.
Not sure if this helps answer your question though... Sorry.