Eras of X-Men
Courtesy of Marvel Comics. Silver Age - 1963-1970 Bronze Age - 1970-1985 Modern Age - 1985-present
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Eras of Teen Titans
Courtesy of DC Comics. Silver Age - 1964-1970 Bronze Age - 1970-1985 Modern Age - 1985-present
Eras of Avengers
Courtesy of Marvel Comics. Silver Age - 1963-1970 Bronze Age - 1970-1985 Modern Age - 1985-present
Eras of Justice League
Courtesy of DC Comics. Silver Age - 1960-1970 Bronze Age - 1970-1985 Modern Age - 1985-present