I mean I also feel like people would be pretty happy with the average lifespan of a tree, or a Greenland Shark, etc. Also, some few (fairly primitive) animals

I mean I also feel like people would be pretty happy with the average lifespan of a tree, or a Greenland Shark, etc. Also, some few (fairly primitive) animals are "biologically immortal," for example, lobsters (which are motile and vaguely resemble us more than, say, sponges and jellyfish) don't experience senescence. That being said, I think we have a long way to go if we want to make any progress at all, and I doubt I will live to see it.