Welcome Felicity
It does seem unfair that the experienced and mature have to polish their resume to be competative in today's job market not to mention having a hearing issue as well.
All of these things are obstacles that can make your job search more difficult but your determination greater.
While you are polishing your resume be sure to leave out any age related dates that are not necessary such as the year you received your degree, having the degree is sufficient enough. High School information is not necessary since you have a college degree. Never list your date of birth on a resume, it is not needed information. Also remove any outdated computer skills and replace them with current computer programs that you have knowledge of.
I have found a website in Australia that may be of some help:
Job Services Australia Good luck in your search and keep us posted. I hope the above website will be of some help to you.