They can always start a new line of comics in a new continuity (i.e., Marvels ``Unlimited'' line).
DC had Earth 1 and Earth 2 back when I was collecting (as well as Earth S and Earth 0, our earth), so yeah, the Earth 1 Batman would be 80 or so and long-retired, but they could've then started up Earth 3, 4, &c.
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