There was a question: what kind of person would want immortality?
At any rate, people exhausted by life would not want "immortality." They placed their hopes in the next life, hoping they would be luckier then and be born into a wealthy family—or one they considered happy.
This idea originated from the cycle of reincarnation in Buddhism. Buddhism held that our actions formed a force that would make us suffer all kinds of karmic consequences in the future.
A person who committed evil in life would go to hell or become an animal after death; a good person, meanwhile, would go to the Western Pure Land, or escape the cycle of reincarnation and become part of Buddha.
What could one enjoy in heaven? Some people could already feel it while they were alive. There was no need to wait until after death.
Unlike those people, Voldemort was not obsessed with the stimulation brought by sensory pleasures. He wanted immortality because he loathed failure. It was said that his Boggart was his own corpse.
Humanity had given up immortality in exchange for the ability to evolve. Ordinary jellyfish died after sexual reproduction, but the immortal jellyfish could revert to its polyp form. There was no limit to how many times this process could occur, so this jellyfish could live indefinitely. Unless it was eaten by another animal, the immortal jellyfish was "immortal."
Its cells would not mutate, which meant it had no capacity for evolution.
Yet humanity's pursuit of longer lives and restored youth had never ceased. Women in particular were almost obsessively attached to preserving their youthful looks. But no matter how carefully one maintained oneself, one could never look as fresh and natural as a younger woman.
Young witches like Merope, lacking judgment and caught in trouble, needed help.