Tweetin' when I'm 70, these half-dead followers

from Childish Gambino (Ft. Hypnotic Brass Ensemble & RZA) – American Royalty Lyrics on Rap Genius

Meaning

If he was tweeting at 70 years old, he’d be an old man with death round the corner using Twitters “following” tool to check out tweets,

Also If he is still tweeting at 70, half of his followers will be dead, and most of them will be half-dead (as in old)

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