But you're either gettin' lazy or you don’t believe in you no more

from Dr. Dre (Ft. Eminem & Skylar Grey) – I Need a Doctor Lyrics on Rap Genius

Meaning

Two relatively superficial reasons Dre is not finishing his music.

Maybe being 46 also has something to do with it?

In relation to the line before this is Em saying Dre comes to him with beats and finished single tracks which are great but he doesn’t finalize them. And Dre has clearly been having difficulty deciding what to include on Detox (evidenced by the amount of times the album has almost been released).

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