Congrats on the results!
The older I get, the more I have to be aware of impact on my knees and the pain it generates in my lower back as well. I generally stick to step mills, bikes, elliptical, rowing machine and long walks with the dogs. If I run, it's for no more than 1 mile as a warm-up for something else.
I hate cardio in general, it's a necessary evil but I can't go to get a workout in and just do cardio. Over the last 6 months, to aid in my weight loss, I've changed the way I lift. I still lift 5 days a week but instead of max effort I'm now doing super sets of almost everything and doing about 50% of the weight for a rep range of 15-ish. This allows me to keep heart rate up during lifting and leading into my cardio sessions.