Same old man from years ago told me life is short

from Nas – Trust Lyrics on Rap Genius

Meaning

Nas could be talking about the old man from “Every Ghetto”:

Words of a old man with silver hair, in his wheelchair
His eyes were bloody while describin what lies before me
Said evil bitches and jealous men would try to destroy me
It occurred to me, this old nigga’s words couldn’t be realer

or possibly the guy from “What Goes Around” though he wasn’t stated to be old:

Life is short is what some nigga said

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