Letitia, I'm a Gleason 9 with high initial PSA (63) of ten years vintage, aged 73. I have had lymph node involvement, only noted in the past year or so. I think that PSA reduction you reported is fantastic and you should draw great comfort from that. There are many more treatment options available now than there were for me, though mid-ten cycle chemo, I'm catching up fast.
Just a word of warning - sometimes PSA can bounce around a bit, so be prepared for ups and downs in numbers as well as emotions, but I advise positive thinking, good balanced diet, plenty of exercise and living for the day, in confidence that there should be hundreds more ahead, PCa spread or not.