Major knee problem

I tore my right inside meniscus years ago and had several cortisone shots and finally operated on. 3 months later the same Doctor operated on it again. I finally went to another Doctor and with a fresh MRI he told me the first Doctor really BUTCHERED my knee and had to operate again. He said by then arthritis was going to be a BIG issues from the operations. In 2015 I was walking 4 miles a day 5-6 times a week. 2017 now retired my left knee started acting up. I'm getting by but with both knees now being affected mt co pays are to high to have a knee replacement. I'm almost 63 now but will probably have to put it off until 65 when I get Medicare. I looked into Stem Cell treatments but it was about 7500.00 per knee. Now kicking around trying some of those cremes made from Marijuana.
My father had stem cell done on his knee. He is 78. Surgery/injection was last year. Just had a checkup and he gained 2mm of space. He could not be more thrilled with how good the knee feels. Got it done in Fayetteville Ark. cost him right at 5k. He is thrilled