I think its cause I can't really see myself an old guy
And that scares me, I wanna be around a while

from Childish Gambino – Fuck It All Lyrics on Rap Genius

He is referring to the last rhyme that included “crying while writing.” He says before he doesn’t KNOW why, but he thinks it is because he can’t see anything that he will be or do when he is older. This scares him because he wants to not die young, and lice a long life.

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