If you think that we born on 1920...2000 and knows that the sun will explode 4 to 5 billion years from now. you will say that the time is a strange thing.
I can not say that i will die before i know when will be the end of the humans. But what i can say is that we will end if the earth ends.
The end of humans will be when a meteor strikes earth... that's the only way.... because until 4 billions years.... the chance to a meteor reach us is very big nowadays.
What more can happen for the end of the humans?