I am an otherwise very healthy and active 83 year old woman, and I've been taking Methotrexate since 11/23 after my initial diagnosis of PMR in 10/23. I am down to 4 pills/day (10 mg). I have had no side effects and have fortunately not had a flare up of the PMR since the original onset 09/23. I was on Predisone for five months, finally tapering down to zero 03/24.
The only problem for Methotrexate according to my rheumatologist is that it can make one 20-30% more likely to catch an infection although I have been quite healthy since this all happened.

Good luck to your husband!