Starshine appeared in a 1980 storyline in "Superman" (which was a sequel to "New Adventures of Superboy" #5).
Summary of the story: Aliens grant Pa Kent the gift of being allowed to see what his son would be like in the present (years after his death) via arranging things as if he'd never died---which scares Superman (the only one to notice this oddity).
Meanwhile, the means the aliens used to do this inadvertently granted some hippie teenager named "Starshine" the power to gain anything he wants by saying "please." He uses this power to, among other things, make Superman take a "slow boat to China" (literally) and, biggest of all, make everyone in Metropolis over the age of 30 leave town (Superman, Lois, Lana, and several others in this story are 29, and they weren't affected).
From
www.supermanhomepage.com...
Action Comics #507 (May)
The Miraculous Return of Jonathan Kent! - The Return of Jonathan Kent - Part 1 of 2)
Cary Bates; Curt Swan & Frank Chiaramonte
Superman is shocked to find Pa Kent suddenly appear alive and well and visiting him in Metropolis. A young hippie has the power to have his commands granted.
Action Comics #508 (June)
"The Secret World of Jonathan Kent!" - The Return of Jonathan Kent - Part 2 of 2)
Cary Bates; Curt Swan & Frank Chiaramonte
Aliens, who were saved by Jonathan Kent many years before have repaid him by allowing him to spend 30 hours with his future son. A side effect was the empowering of Starshine.
Thank tou for the explanations! I didn't know that story.