Thread:TheEmpoleon65/@comment-34326521-20111119095413/@comment-34326521-20111119095851

Diamondhead's trivia section: "*Diamondhead might be immune to Eon's aging ray because he is made of diamond and diamond doesn't age, however, it's possible Diamondhead might age and become elderly. "

First, he is made of diamond and diamond doesn't age; therefore he IS immune to Eon's aging ray. Second, you added your own speculation (the part I underlined) to it. 