Help Sexing Triceratops Beetle

Anybody with experience with these animals that can help tell me if it's female or male and what age it appears to be roughly? Hoping to get some more and do some breeding. This is Phileurus Truncatus, right? I'm hoping to start a breeding project for size and horn length. Any help identifying what this one is and tips for identifying characteristics of the species would be very helpful. Potentially thinking about raising the larva in an oxygen enriched terrarium, maybe 25-35%, in flake soil enriched with protein supplements. 

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male, shape of terminal sternite, there are books out there with this stuff in them

 
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