Joker looks really old in this. You think he wanted Superman or Batman to take him out instead of dying of old age?

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Well, I think making him look old works.

In the comic that this film is based on, he admits that he got tired of constantly losing the "game" he and Batman had been playing for decades and that he wanted play on an "easier level".

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The time has come.

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Well, put in that way it sounds too dark. But between Superman & Batman, Joker's decission was right.

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To revive the tragedy behind this alternate universe and watch the Rise of the Regime as well the battle for freedom in the hands of Batman.