A friend told me yesterday that having a character that lived for an insane amount of time makes all his struggles unrelatable, basically. Said character revolves around different ideas, one of them is that he's going to struggle to find meaning when he finally loses everything and realize that anything is doomed to disappear someday. This should lead him to have some existential crisis : "why bothering to preserve things, to accumulate knowledge, etc... when it will all cease to exist in billions of billions of years ?" basically. And that's where my friend tells me it's unrelatable, because "billions of billions of years" is so long that it doesn't really matter to us. Rendering the existential crisis unrelatable/weird. One of my goals with that character (aside from creating an interesting story) is to explore what would be the consequences of being eternal. How you could achieve that given what is known of physics today. And why would this be desirable or not (mostly not in fact). But now, with what he said, I'm a little bit less confident about this.