Christopher wrote:

There are countless works of series fiction that selectively ignore or reinterpret aspects of their earlier continuity -- like the way it was explicitly 1962 when the 15-year-old Peter Parker got spider powers, yet he was in college when Star Trek: The Motion Picture came out in 1979, and is still presented as being in his mid-20s today in 2012. Marvel and DC have routinely kept parts of their history while ignoring others.
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Which Marvel and DC spun off and expanded as Multiverses acknowledging and making money off of the differences.