As near as I can tell, Henry is the only one who aged in Storybrooke during the first curse.
Henry is also frustrated by the sameness in town, and believes he doesn't belong.
I don't know if by sameness they mean "it seems like nothing in the town ever changes, I mean, even the pregnant woman never seems to give birth."
One would think Henry would notice that none of his classmates aged, and he advanced in school while the others didn't, but maybe he is just slow. As in slow witted...
For twenty-eight years, Ashley remains pregnant until Emma arrives in Storybrooke, to which the curse begins to weaken and time starts to move forward [giving birth to Alexandra]
I can't find anything definitive. But I would wager because she comes from a land of magic, the anti-aging properties of Storybrooke work for her as well as the rest of the imported townspeople.
People outside of Storybrooke age at the regular rate, including Emma, Neil, and August.