Does magical aging have the same effect as natural aging on children? [closed]

If an infant human was magically aged 20 years (say they encountered a ghost), would they be a fully functioning adult, or a horribly aged child?

Having an encounter with a ghost turn a nursery full of children into physically normal adults (with some 10-year-olds) seems to be what the results of the game mechanics would be.

Is that correct?