Retirement benefit claimed after compulsory retirement age

Dear PAO,

My older sister sought her retirement benefit from the private company she used to work with for more than 15 years but was declined. The company told her that she should have claimed her retirement benefit when she turned 65 years old. According to my sister, it is absurd for her to do that when she was still employed with them until she turned 69 years old, which was just less than a year ago. What happened was, the company kept extending my sister's employment even after she turned 65 years old. She accepted each time and reported working diligently. It was only a month before her 69th birthday when she was informed that they will no longer extend her contract. So, that was when she started demanding for her retirement benefit. But the company is resolute about not giving her what she is asking for. Is my sister really not entitled to such a benefit anymore?