Tithonus

Tithonus was a figure in Greek mythology. According to legend, one of the Greek goddesses asked Zeus to make Tithonus immortal, but she forgot to ask for eternal youth. He became so ancient and decrepit, he eventually shrank into a cicada. He begged for death.

Tithonus' story was compared to the real-life situation of Miracle Day, in which all of humanity was made immortal, but they continued to age. (TV: Rendition)