Dear Ashvini,
It is advisable to engage the person as a consultant with a fixed remuneration, and a detailed agreement incorporating terms and conditions should be entered into with the retired employee. The content of the application as written by the retired employee can be as follows:
To Unit Head M/s
Subject: Engagement as a consultant
Dear Sir/Madam,
I wish to inform you that I retired from the services of the organization upon reaching the age of _______ years, as per the retirement policy prevailing in the organization. Although I am in good health and able to continue offering my valuable services to the organization and share the rich experience I gained during my employment for the benefit of the organization.
I hope you will kindly consider my request positively.
Thanks