Cad Bane uses the breathing tubes (which embed into his cheeks) when he has to do work in atmospheres that require breathing apparatuses. The Duros species that he's a part of normally don't use breathing tubes, which is why you would see him at times go about without them on (ex: hiding inside a Clone Trooper armor).
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Cad Bane was created in 2008.
No one knows how old Cad Bane is because either an age hasn't been given for him or has not been revealed to the public as of yet
So he could survive in extreme conditions that have no oxygen, such as being tortured by being placed underwater, he could still breathe.
Cade Bane's species is Duro.
Cad Bane's fate hasn't been revealed yet. But personally, I hope he does because I hold a deep grudge against him for him nearly killing Anakin and Ahsoka in front of each other's eyes.