I wanna be (Aye, may the best of your todays)
Forever young (Be the worst of your tomorrows)
Do you really want to live forever (But we ain't even thinkin' that far)
Forever (ya know what I mean?)
Forever young

from Jay Z (Ft. Mr. Hudson) – Young Forever Lyrics on Rap Genius

Meaning

Jay sends his wishes that while you’re still on Earth you live a happy life, each day better than the last. He gets this from the wedding toast which usually reads

“May the best of your yesterdays be the worst of your tomorrows

But Jay lives in the present.

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