I know that in the world of comics, heroes don't really "age" but does Zatanna age like a normal human? Does she age slower? I would like to know. Thanks and God bless :)

I think so..

Zatara was active during WWII

So it would mean that she ages slower... What kind of age do you think she physically has?

Zatanna knows magic so maybe she is using some of her magic to remove some of her wrinkles. Most comic characters will not age in real time same as forever young Popeye.

Magic casters have long lives, especially in comics. Odds are she knows quite a few "**** you father time" spells

This.

I bet she ages slowly. Maybe her homomagi physiology makes her look as young as Dick Grayson, when she could maybe be Bruce Wayne's age

I dont think she ages any slower or faster than any other human.

As for extending her lifespan through magic... I wouldn't count on her having used any of it, considering thats always the kind that comes with huge costs... like being tied to a demon for eternity, loosing your mind or having to do something unspeakable.