Look at Izumi... he died when he was 5 or something but he looked ~15 in the manga. I say Shinigami do age.
In any case, in the manga, Takuto did not really die, he was in a coma on earth the whole time so I think he did age... In this sense Takuto would be a bit too old for Mitsuki, but look at him! 10 years and he did not look one year older... so I guess it does not really matter.
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