Dear Luza
"comes into effect whenever a staff is 58/60 years old or has completed a consecutive service length of 25 years in the.............., which ever is earlier."
In my opinion there is No need of giving the maximum service length of 25 years, as suppose an employee has joined at the age of 25 years after the service of 25 years he still be 50 years of age, means he / she will retire by 50 years of age. The retirement should be at the flat age of 58/60 years.
In the heading "Entitlement of Benefits upon Retirement"
"All employees" can be replaced by "All regular employees" mentioning specifically that contract, casual, trainees employees etc category of employees are not eligibile or covered under this scheme.
Instead for asking for the option from the employee, first recommendation may be taken from the HOD, that whether the extension can be proposed for the employee or not, and also avoid using the world "RIGHT" like in the "The Right of the employee to request for reappointment".
Also avoid to use Contractual re-appointment instead "Consultant" or "Retainership" can be used.