Exactly! It's funny you word it that way.
I'm a comic book geek in my spare time. One of my long time favorite comics was Elfquest (my son is actually discovering it for the first time this month
Time and longevity and the issue of what makes life worthwhile is one of the reoccurring themes with this series.
Immortal shape shifting space faring aliens, searching for evidence of their own lost kind decide to visit a medieval world because they see evidence in the European-esque human culture of creatures with powers similar to themselves. Their lost kin? They shapeshift into the fantasy creatures (elves) they observe from the human fantasies but instead of stopping for a short visit, their ship warps accidentally through time and crashes. So they come out 20 thousand some years into the planet's primordial past, get the snot beaten out of them by neanderthals and escape into the woods.
The rest of the series is them dealing with immortality on a very harsh mortal world. One of the original crash survivors in a bid to give her people a chance at survival shapeshifts into a wolf and joins a local wolfpack,has a mixblood mortal baby who in turn grows to teach the castaways how to survive, reproduce (they'd lost the memory of it with immortality), and live as a part of the world.
So, you can imagine all the angst that arises between the immortals and the new wolfblooded mortals (who only live some 2000- 6000 years if they're lucky), and the knuckle dragging short lived humans who evolve over countless generations with these fantastical and mostly unwelcome colonists.
What does make life worthwhile anyway? Living a short life to the fullest, experiencing everything your skin has to teach you? Or living forever, mentally divorced from your physical shell if you can help it to explore mental pursuits?
I think our ratties can teach us a lot on that front.