What can I do if an employee had indicated that they will retire on a certain date but then do not do so?
If an employee has given formal notice to leave, you are under no obligation to let them withdraw their notice. However if an employee tells you during a discussion that they are planning on retiring, they may change their minds before formal notice is given.
Where an employee decides not to retire and no notice has been given, the first thing to do is to discuss with the employee their reason for not retiring. This can help to establish whether there is any issue that you, as an employer, might be able to help them overcome thus allowing them to retire on the due date or shortly thereafter. Ultimately however, if they decide that they do not wish to retire, for whatever reason, then you cannot compulsorily retire them as this will leave you open to a complaint of unfair dismissal.