Often adults are divided into three distinct groups:

Question

Quizplus · Accepted Answer

This choice has the most reasonable age groupings that are consistent with commonly used designations. The young-old group starts at the age of 55, which is often considered the beginning of the "senior" phase of life. The middle-old group stretches to 75, which is a reasonable age for the transition between middle and old age. Finally, the old-old group starts at 75, which is a common age that marks the beginning of the "very old" stage of life.

Often Adults Are Divided into Three Distinct Groups