SuperFriends timeline, or a chronology of events that took place in the SuperFriends Universe -- Earth-1A (fan name) / Earth-Thirty-Two (official designation) of the DC Multiverse. |
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The 2040s was the fifth decade of the 21st century.
By the first year of this decade, Superman, assuming he was still alive, would have had his one hundredth birthday. It is reasonable to assume that he would still be alive since his lifespan was likely longer than a human's lifespan.
However this is not a certain fact, as he may have been killed at some point prior to this, by means other than natural causes. Nevertheless, it seems likely that Superman was still alive at this point, possibly even still in his prime.