Golden to Modern
Those active in the comic Golden Age (late 1930s - late 1940s) that are/were still active in the Modern Age (mid-1980s to present) . To make the list a character must have some of their Golden Age history as part of their current origin. In other words, if they were created in the 40s, their current origin has them active in the 40s. Characters appearing in Modern Age comics set in the Golden Age do not count.
Also, any retcons that change the character's identity at the time don't count. For example, GA Wonder Woman was retconned to be not Diana but her mother Hippolyta, which excludes Wonder Woman from this list.
Concerning DC: For simplicity's sake, let's say the Modern Age starts right after Crisis on Infinite Earths.