She grows up to be the wife of Draco Malfoy and mother of Scorpius.
Astoria was two years younger than her sister Daphne, who was in Draco's year at Hogwarts. Since Draco was born in 1980, we can assume that Astoria was born two years later.
Astoria Greengrass is born
Date circa 1982
Certainty Inferred from canon
Type of Event Wizarding world