Or I remember. Its just in my head, she wouldn't try them at all. She'd say "Clark, I'm a human being, humans age, humans die. I will be no different".
The difference between living eternally in a spiritual sense as opposed to the physical sense in this particular aspect is that, the spiritual sense as it would be written here would be natural. If we imagine in our lore that the afterlife is real and indeed a natural part of the order, which I subscribe to. Eternal physical living for a normal human on the other hand is unnatural, using science, magic, or whatever to unnaturally extend life. I just don't feel Lois Lane is the character to do that with. She's one of the pinnicle's of humanity that Superman respects and loves so much. She of all characters I think should be granted the honor of living and dying naturally as a human would, and with grace and dignity (this does not in my mind include being tragically murdered to drive a new pathos for Superman).
But that's just my take, and its a take that never truly comes to pass as we never truly get to that point in their lives since these characters are timeless. So its all relegated to the imaginary story, and everyone will have their own take that I respect. This is just my personal ideal.