Originally Posted by
Jim Kelly
Or maybe not. I'm looking at the SUPERBOY SPECTACULAR (1980) and one of the stories it reprints is "Life on Krypton" by Jerry Siegel and George Papp, from SUPERBOY 79 (March 1960). Superboy uses his mind prober ray for the first time and recalls what happened on Krypton when he was a child, as they are celebrating the 6 Billionth Birthday of Krypton, using a Time Clock. The cosmic clock shows the moment when the planet was born.
Six billion seems about right--that's a couple billion years more than Earth, but still within the age of the universe, which is over fourteen billion years old (according to estimates).