I love your timeline, its very helpful! Do you have any idea what age Duke would be?
So the thing is that my giant timelines are all specific to the post-Crisis/pre-Flashpoint era (1986-2011).
But Duke wasn't introduced until after Flashpoint (2011), in the New 52 (2011-2016ish). And that's a completely different continuity with it's own timeline. You fundamentally cannot make the New 52 timeline even remotely line up whatsoever with the preboot timeline.
So I can tell you that Duke was introduced as a teenager, when Tim was also a teenager...but that's entirely unmoored from my very detailed mathing of preboot ages. And the New 52 timeline is absolutely awful and I hate it so much :( Maybe Rebirth (2016-2021) ages will be better; I'll keep you all posted.
If I was going to fit Duke into a preboot timeline, I would probably put him between Tim and Damian, and much closer to Tim in age. But that's just me roughly translating it over. There's no real canon to rely on here.
