I'm not that bad although I'd have to think hard to remember
what I had for dinner yesterday or how old I am. And if you
can't answer things like that then you may be put in a home.
Longevity and immortality are obviously attractive in
simple terms. Science fiction on the other hand has
to present more-or-less realistic characters for a
reader to identify with, and that's difficult if they're
all 10000 years old, although that is a foreseeable
outcome if the robots don't take over and exterminate
us first. So a lot of stories have to assert that
their future setting doesn't include hyper-longevity
or immortality because that state is undesirable in
some way.
_Doctor Who_ in particular has represented immortality
several times as unsatisfactory, despite cheating
by having a central figure who is hundreds of years
old and usually just gets better when he is mortally
injured. Proposed drawbacks that do partly make sense
are that you get tired of being alive eventually -
although still preferring it to the alternative -
and that you may forget who you were and who your
friends are or were, so you're not even the same
person any more - so why would your old self care
whether your new self lives or dies? But I'd still
try it. Oh, and the other angle used in some stories
is that immortality is just ridiculously expensive
and therefore very selfish. (Especially the kind
that requires the blood of virgins at frequent
intervals, that sort of thing.) So only a very
selfish person would want that.
_Star Trek_ is interested in that and also in
super-evolution. I don't know if there was an
overall policy, but it seems to me that a recurring
theme is that a society that develops too quickly,
or a human who is advanced by genetic meddling
or by a cosmic encounter, is a danger to themselves
and to others. In "The Apple", a small community
of immortals live as stupid tribesmen serving the
computer which maintains their environment.
I don't remember if "Plato's Stepchildren" are
immortal, but they're certainly jerks. And in
"Return to Tomorrow", the survivors (in big globes)
of a super-scientific society that foolishly
exterminated itself demonstrate that they didn't
learn enough when that happened.
Would it really be like that? Well, old people can
be cranky, and some smart people, too. But I don't
think that those states preclude being nice.
I think the main problems of being old are when your
body hurts and/or your body and your mind stop working.
That is quickly tedious.