You're probably already on the phone or maybe already off it. Might save you the hours waiting...
But this would indicate your not eligible given your age.
https://www.health.gov.au/health-ale...ts/eligibility
Point 7 regarding diabetes is in the section for Senior Australians, which by my math you aren't there yet... Unless I'm missing something.
I was curious to the full price of the pills and looked it up on the PBS and saw a remark about needing to be over 70 then checked out that Fed Gov website for eligibility.