I do think Turmeric helps with inflammation but I didn't start taking it until around the time of my second occurrence of PMR. I recently bought some Turmeric Ginger Tea at Trader Joe's that @lioness recommended and it does seem to help in the evenings and it's not bad tasting. The people I think that get the most from using Turmeric make "golden paste" and then use it recipes but I've never tried it. There is a great website that has a lot of information on it's use here:
-- https://turmericaustralia.com.au/turmeric-paste/

When I was struggling tapering off of prednisone for the first occurrence of PMR I talked with my rheumatologist and he was the one who told me of another of his patients who was a professional athlete that took 1/2 mg daily for almost a year before he was able to taper off with no pain. He did tell me he sees a lot more older folks with PMR but really didn't give any numbers. I did find a study in the UK mentioning the prevalence here:

Incidence, prevalence and treatment burden of polymyalgia rheumatica in the UK over two decades: a population-based study
-- https://ard.bmj.com/content/early/2018/10/08/annrheumdis-2018-213883

John