Simply replace the unfilled areas such as "" and "[date]" with your information.
After much deliberation, I have decided that the time has finally come for me to focus on my family. Therefore, I have decided that I will be retiring on [date].
My time as a [position] at [Company] has been truly enjoyable. My career and professional abilities have thrived here. My fellow team members are among the best in the [industry] industry. My positive experiences here will stick with me throughout my life. All of the [Company] employees have my warmest wishes for the future.
I would appreciate your assistance in completing the retirement process. Please let me know if there is any additional information that you, or the Human Resources department, require.
Thank you again.