Here are some websites that specialize in jobs for older workers:
DinosaurExchange.com: Lists short- and long-term job opportunities for what it terms "dinosaurs" (retirees with experience), including consultant and management positions all over the world, some in developing countries
Enrge.us: The Employment Network for Retirement Government Experts assists retired federal, state, and local government employees with continued employment.
ExecSearches.com: Connects experienced nonprofit, government, education, and health workers with executive, mid-level, and fundraising positions
Execunet.com: Executives who make over $100,000 annually can network with like-minded professionals and talk to recruiters.
Jobs4Point0.com: Focuses on job seekers ages 40 and over
RetiredBrains.com: Offers nationwide job listings searchable by industry or state
RetireeWorkForce.com: Hosts virtual job fairs as well as job postings and résumé services
RetirementJobs.com: Certifies employers as offering a friendly work environment for older workers
Seniors4Hire.org: Seniors can apply for jobs, submit a résumé, or post a description of their ideal job.
ThePhoenixLink.com: This nonprofit group connects experienced executives and technologists with short- and long-term management positions.
WorkForce50.com: Lists jobs exclusively from employers who are enthusiastic about hiring workers over age 50
YourEncore.com: Connects retired scientists, engineers, and product developers with consulting and short-term assignments