Oldboys

There was this biking gang - all of them barely thirty odd years old. On one biking trip through some particularly dense forest, they were bitten by the pse-pse-pse fly (and a particularly rare variety, at that). They were all infected with a particularly miserable disease which caused them to grow long white beards, long white hairdos, and ditto for mooches; their skin to shrivel up; their teeth to fall down; their memory to weaken... In short, it was a bikers' gang - sans everything.
"Tch, Tch," an acquaintance, remarked,
"Early, they wizened"