FWIW, I'm in the same vintage, but my (black) top looks fine. You can see a bit of a ripple where it folds, but not particularly noticeable. No frays or pulls.

No real words of advice, but, here's my usage and care profile as a reference. In NC, our weather runs a wider range than you get in Sydney. Lows in the winter average in the low 30's; highs in summer average in the upper 80's, and there are plenty of days 10 degrees or so beyond the averages. The car stays garaged when at home. I leave the top down most of the summer (not really following the instructions that you should keep it up when not in use). That probably means a bit less movement wear, but a bit more prone to wrinkles. Minimal wash / soap wear. I use 303, but probably only about once a year.

 

 

My '14 is hoding up well but a few fold marks. Did cleaning this year and it looked great all summer, I used Chemical Guys but plenty of good products. Going to do it again but we don't really have seasons. Weather gets cooler, 80's day time maybe 60's at night so roof is down a lot. No real rain till Jan.