Loneliness can find you even in a building full of people. A University of Michigan National Poll on Healthy Aging asked 3,486 Americans aged 50 to 94 about their friendships and found that 1 in 10 had no close friend at all. For baby boomers moving into retirement communities, that number matters: social isolation wears down healthy aging and longevity, and sometimes all it takes to stop it is one person who remembers you. June H., 78, a retired bank teller and grandparent of five, moved into a retirement community near Toledo, Ohio, braced for solitude. She found friendship, a forgotten act of kindness and a baseball from 1962.