Dear Luza,
"Comes into effect whenever a staff is 58/60 years old or has completed a consecutive service length of 25 years, whichever is earlier."
In my opinion, there is no need to give the maximum service length of 25 years. For example, suppose an employee has joined at the age of 25 years. After 25 years of service, they would still be 50 years old, meaning they will retire by the age of 50. The retirement age should be a flat 58/60 years.
In the heading "Entitlement of Benefits upon Retirement," "All employees" can be replaced by "All regular employees," specifically mentioning that contract, casual, trainee employees, etc., are not eligible or covered under this scheme.
Instead of asking for the option from the employee directly, the first recommendation may be taken from the HOD to determine whether the extension can be proposed for the employee or not. Also, avoid using the word "right," as in "The right of the employee to request for reappointment."
Also, avoid using "Contractual re-appointment." Instead, "Consultant" or "Retainership" can be used.