In Batman Ninja, modern-day Batman, allies & rogues get sent to Sengoku period Japan by Gorilla Grodd's time machine. That sort of time travel could be a useful tool to headcanon a modern-day Batman somehow becoming a 1983 Dark Knight Returns Batman or whatever.Personally, I consider the following DC animated movies to be a universe:
- Justice League: The New Frontier (1953 - 1960s)
- Batman: Soul Of The Dragon (1970s)
- Batman: The Dark Knight Returns (1983)
Bruce's age actually matches up with this and it works. I also count the Superman animated serials of the 1940s as prequels to The New Frontier since Superman shows up.
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