My rheumatologist said basically the same thing. I thought he had me confused for someone else when he said I was "too young" and "too healthy" to take prednisone for the rest of my life. I was 65 years old but I felt much older --- over 100. I took prednisone for 30 years already but daily for PMR for only 12 years. I didn't think the remaining years of my life would be very long.

Actemra gave me a new lease on life after I was finally able to taper off prednisone. My chronological age is how I currently feel. I'm 70 but getting to 90 seems feasible but 100 might be pushing it. I feel healthier as evidenced by 10 other medications in addition to Prednisone I have also stopped taking. Time will tell but I don't have the steroid burden or PMR anymore as long as I do a monthly Actemra infusion. The following study was funded by Genentech but other studies suggest the duration of PMR/GCA treated with Prednisone is much longer than 2 years.
https://pmc.ncbi.nlm.nih.gov/articles/PMC7991019/
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"The higher-than-anticipated number of patients with continued disease and exposure to glucocorticoids at 2 years suggests a more chronic nature of GCA and PMR in this real-world study rather than the existing expectation that GCA and PMR often resolve within 2 years of therapy. These results highlight the need to consider a potential long-term disease course in patients with GCA and/or PMR and for the use of efficacious, glucocorticoid-sparing therapies in these patients.
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Now my rheumatologist says it is clear that my overall condition is much better on Actemra. The turnaround happened within a year of getting off Prednisone. I had forgotten what it was like to really feel good again and not needing Prednisone every day.