Meanwhile, volunteer work through committees, organizing events, or maintaining skills such as golf, tennis, or car maintenance can go a long way to help retirees keep their wits about them.

FORBES: Planning For A Posh Retirement

In still others, the skills are more nebulous, such as handling people or researching and organizing information.

FORBES: Why Apprenticeships Are the Fastest Way to Acquire Skills

Rosenberg had him do an assessment of his skills, and he realized he was good at developing work schedules and organizing and managing people according to their strengths.

FORBES: How To Get A Job When You're Over 50