Start by determining if you are a good candidate for extended work or flexible and phased retirement. A realistic look at your employer and manager attitudes and your own readiness will help you decide how to proceed.
Do you and your employer share basic beliefs about the employment bargain, performance expectations and flexibility?
Are you comfortable with the principles that define successful approaches to extended work and flexible retirement in other settings?
What are common standards of years of service, age and performance history that could help frame your proposal?