Laura Stillman, 62, a sales manager at a television station in Raleigh, N.C., who was recently divorced after 27 years of marriage, fills her free time with yoga, tennis, swimming and socializing with friends. She has also gone out on a few dates. But she still misses the companionship of her marriage and worries that she may have to hire a nurse someday if she falls ill, since she no longer has a husband to count on.