Nirvana fans will feel REALLY old after this one -- the group's groundbreaking "Nevermind" album turned 25 Saturday -- and the cover baby's got a beard!!
Spencer Elden, now a 25-year-old with long hair and scruff did a shoot with photog John Chapple to honor the anniversary.
A lot's changed since then ... but one thing's for sure, the album is still legendary.
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