system
Given the following post, respond as if you're commenting on Reddit:
human
[Fiction] Would anyone remember language or anything after being alone for millions of years?

So in Stories I've seen many times where a Character has been alone or in a void or something for millions of years or thousands & when our main characters meet them they understand English very well, but is it realistic for someone to understand anything after being alone for so long??
I mean i think staying alone for that long will make anyone crazy as hell

Spoilers for Attack on Titan
But in that show there's a girl named Ymir who has spend many many millions of years alone, but she understands whatever our main characters say to her.
gpt
Depends on a few things. 

A human left alone for a few decades will be pretty well insane. If they dont kill themselves first. 

If you have some form of stimulation you might be able to stave off insanity, if you have stimulation like media in any form  youll still be exposed to language in some form. 

Additionally we dont know what memory capacity looks like, can a baseline human still form new memories after a millennia? Does the brain just keep overwriting old connections to make new memories? Will the brain stop making long term memories and you just live with a short term memory to protect your own mind from shitting the bed? 

As for non human intelligences who the hell knows.