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"Johnny Knoxville was 29 when Jackass hit MTV in 2000, and by then he'd already been dyeing his graying hair brown for a few years. His father had been 19 when his own head turned white, so Knoxville was prepared."

Interesting!

He's only 50. For reference, John Mayer is like 44.

yeah, he looks really old in that pic though.

I though he looked shockingly old in the last film too, which was over a decade ago. He hasn't aged much since then though.