And glad to have you Kal. Sorry about the spoiler.
More to come...
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Well Dar was a first generation Clone, so to speak, so he's older and not going to live as long even with the cure. Jusik is a Jedi, and Jedi seem to live longer. Venku was Dar's kid, so of course he's likely to outlive his old man. However, it's entirely possible Dar is still alive and just didn't show up. And since the Nulls are still around, and Skirata was actually talking about extending the clones lives, not just making them normal, toward the end of Order 66. So Dar should probably be alive as far as age goes if he got the cure.