When a business is transferred as a going concern under section 197 of the LRA, all terms and conditions of employment, including any agreed retirement age, are automatically transferred to the new employer. The phrase "agreed retirement age" in section 187(2)(b) of the LRA includes retirement ages agreed with a previous employer where the employment relationship has been transferred under section 197. A new employer's promise or intention to harmonise employment conditions does not constitute a variation of the contract of employment in the absence of a formal written agreement, particularly where the contract contains a non-variation clause. Where an employee has reached an agreed retirement age (whether agreed with the current or a previous employer in the context of a section 197 transfer), the dismissal is fair under section 187(2)(b) and the employer has no obligation to afford procedural fairness before dismissing the employee.