Then he said that he was the same age as... myself
And it didn't help cause it made me even more rude and impatient

from Drake (Ft. Kendrick Lamar) – Buried Alive (Interlude) Lyrics on Rap Genius

Meaning

Kendrick and Drake almost share the same age (June 17, 1987 and October 24, 1986).
When Kendrick sees everything that comes with the fame he wants to become famous, too. ASAP!
He gets impatient when Drake tells him that his time is yet to come and that he probably should focus more on a healthy growth as an artist than to rush to his 15 minutes of fame.

Kendrick is amazed and jealous a person nearly the same age as him could have achieved so much. Kendrick seems slightly intimidated that Drake is so much further ahead in terms of popularity, when they’ve both had the same amount of time as rappers to establish themselves.

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