Question

In 1900, _____ of children 10 years old had four living grandparents; in 2000, _____ of children 10 years old had four living grandparents.

Answer 1

In 1900, four percent of children 10 years old had four living grandparents; in 2000, forty percent of children 10 years old had four living grandparents.
The current movement in delaying childbearing is likely to offset the growing longevity of grandparents somewhat.