Walter Koenig, Star Trek’s Chekhov, has a mantelpiece loaded with action figures, ranks of them. Earth-2 Flash stands out. Koenig was already 20 in 1956, when the Flash got revived. His autobiography makes no mention of superheroes or comic books.
by Tom Crippen
In other words, it’s a mystery.
Sources: How William Shatner Changed the World, directed by Julian Jones; Warped Factors: A Neurotic’s Guide to the Universe by Walter Koenig