Nancy Burner, elder law attorney, describes the THIRD AGE. We have childhood, adolescence, adulthood, middle age, and then what …? The largest growing segment of the population is people over 90 and the oldest baby boomers turned 70 this year. This critical mass could live another 20 to 30 years, or more. They have the opportunity to re-define aging by using their unique wisdom and stories of success and failure rather than hiding behind the triumphs of their youth. Making heads and tales of the Third Age.