I'm pushing forty, she only twenty-one
Don't applaud me, I'm exhausted G

from Nas – No Introduction Lyrics on Rap Genius

Meaning

These lines are the first hint that the opulence described above has taken its toll on our narrator.

Also, he was 39 years old (pushing into forty) still attracting younger women. Even though Nas looks like he never ages, he’s not getting any younger, but he’s cool because he’s rich and living his life, hence the name of this album, Life Is Good.

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