David eventually outclassed her young opponent 9-11, 11-6, 11-5, 12-10, but had to work to defend her Asian Games title after losing the first game.
David, 31, now has three Asian Games singles golds to add to her seven World Open titles.
Low, facing her idol in a major final for the first time, was far from overawed and put in a spirited performance with some flashes of brilliance.
David's experience shone through as she fought back from game ball down in the fourth set to claim the gold.