Do you all think that the Golden Crystal grants Mamoru immortality in the manner that the Silver Crystal grants Usagi immortality (or at most long life)?
I'm of the opinion that Helios is Mamoru's priestly avatar, and thus it is theoretically possible that it does.
What intrigues me, however, is that we have no mention of Helios' relationship to Silver Millennium. He obviously survived it, and yet, we have little to no mention of his relationship to Queen Serenity and her Empire. I don't want to headcanon that he's Princess Serenity's father (I maintain that QS created Usagi for herself and gave her life via the Silver Crystal (RE: Wonder Woman), but I'm open to the possibility that he's Mamoru's father and born in the same manner that Usagi was.