“Living Old” is an earnest---and often sobering---look at the lives of people 85 and older, “the fastest-growing segment of the [U.S.] population,” notes narrator Will Lyman. The episode addresses the expectation that, over the next 30 years, the total of those over 65 is expected to double and fears that, as geriatrician Jeffrey Farber says, “there's not really anyone trained to care for them.” Also included: comments from seniors; case histories.