My demeanor, thirty years my senior
My childhood didn't mean much, only raising green up

from Jay-Z (Ft. Eminem) – Renegade Lyrics on Rap Genius

Meaning

Because of this lack of parental supervision and his selling drugs at a young age, Jay-Z was very precocious: his childhood wasn’t a childhood since it was all about making money — he acted 30 years older than he actually was

If that’s still true, then Jay-Z now acts like he’s — if you’ll allow me to do the calculation here, just one moment…like he’s 88 years old

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