Old guys can still rock out with the best of 'em ... something Mel Gibson and Sylvester Stallone proved Friday night in Los Angeles at a Kiss performance.
Mel and Sly attended a benefit event for a charity Gibson works with called Mending Kids International ... both actors were limited in movement -- but it's clear they're very into the performance.
If you look closely ... Dog the Bounty is also jamming out in the background.
Rock and roll all night.
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