Women are electing to put off motherhood as long as possible now. Maybe it's part of being the "spoiled generation," the products of child-centered homes in a country of plenty. Maybe it's because women need that extra time to get ahead in the workplace. Maybe it's because couples don't want to interrupt their lives with midnight diaper changes.
Whatever the situation, the clock is the ticking--the biological clock and the clock of life. Grandparents can't stick around forever.