After the abolition of the default retirement age, how should employers deal with employees over 65 who are underperforming?

An employer must not discriminate against an employee who is underperforming by disciplining or dismissing him or her on the ground of age. The employer should deal with the employee in the same manner that it would an underperforming employee under the age of 65, by following a fair capability process that focuses on the employee's performance.