Comic Book: DC Comics: "Batman, Junior and Robin, Senior!" (Apr. 1955)
Two stolen gas canisters: one Ages, one de-Ages. Batman inhales one (AR); Robin the other (AP). Several IBs affected (AR, AP). The two heroes continue to fight crime in their original (re-sized) costumes, even at their new Ages/sizes. [reprinted in Batman #182 (Jul. - Aug. 1966)]
Detective Comics (presents Batman and Robin) #395
Comic Book: DC Comics: "The Secret Of The Waiting Graves" (January 1970)
Batman investigated the mystery of a wealthy Mexican couple dependent on a rare breed of flower to maintain their eternal youth.