When Bob Mauterstock asked how many financial advisers in the room had elderly clients showing signs of diminished mental capacity, a few hundred raised their hands. Next, he asked, how many have a protocol for these clients? Fewer than 10 put up hands. With the U.S. population over age 85 growing at a rapid clip, advisers increasingly are facing this issue, he explained last week at the Financial Planning Association meetings in Boston. A 2009 Fidelity survey backs him up: 84 percent of advisers said they had clients touched by Alzheimer’s disease. Mauterstock, the author of “Passing the Torch, Critical Conversations With Your Adult Children,” shared seven tips to help advisers, clients, and their families. While many of his suggestions…