As the baby boom generation approaches retirement age, millions of Americans are facing one wrenching question: What to do about Mom and Dad?

The country is approaching a "silver tsunami," as millions of families reach a new stage of life. According to AARP, there are almost 66 million family caregivers in the United States — nearly 30 percent of the entire U.S. population. Seven out of 10 care for older adults.

"ABC World News with Diane Sawyer" launches a special series, focusing on the sensitive issues surrounding eldercare.

As part of the series, Sawyer hosted a roundtable on the subject with Virginia Morris, author of "How to Care for Aging Parents"; businesswoman Martha Stewart, who partnered with Mount Sinai to open an eldercare center in 2007; and noted geriatricians Neil Resnick and Marie A. Bernard.

Watch: Families on the Brink: The Elderly and Driving

Watch: Families on the Brink: Prescription Problems

Watch: Families on the Brink: Staying at Home