Kurohime
Just got the first volume of the Kurohime manga. The premise is that a witch gunslinger has a curse put on her so that she's stuck as a kid until she falls in love with, or has someone fall in love with her, at which point she converts back to her original age and all of her abilities. Unfortunately, her own personality keeps her 'love' from being more than a fleeting crush before she gets all self-absorbed and ends up being a kid again.
It doesn't have detailed process, usually just one panel on a page or two and some off-panel as well, but every chapter has at least one age shift in it.
And it has lots of action and comedy as well. Bonus. :P And yes I did a search and didn't find any topics for it. Viz is putting out the manga. I don't think there's an anime, at least not one I could find.
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