Low Impact

Rowing boats is more fun than rowing machines, just saying. (I do both, boats when I can, machines when I must. I'm 65; the oldest person who took my club's learn to row class was 81, and did fine. 50+ is common, so you're not out of range.)

There are bike trails, even paved, in lots of areas nowadays, so very limited car danger. Stationary bikes/spin classes are also an option. (I did spin classes twice a week pre-pandemic, bought a stationary bike during, in addition to having a rower. I do better physically if I vary my workouts, vs. same thing day in/out - YMMV.)

Swimming is another option, or canoe/kayak. With the boats, a light/fast boat is relatively more aerobic, the more common heavy/stable ones more anaerobic.

Walking
Dancing
Hula Hooping
Anything in water (rowing, paddling, swimming, aerobics...)
Bikes on trails
Yoga
Body weight exercises (calisthenics without the jumping jacks)

Rowing has been my exercise of choice for the past 5-6 years. Currently rowing 10K meters/day; 5 days/wk.

I also "hate" running and consider riding a bike on the road dangerous; much more so than motorcycling the I did for many years because on a bicycle you are at the mercy of every driver who passes you on the road.

I've got an expensive spin bike that I never use anymore that I've been trying to sell for awhile w/o success so far. And, I do not enjoy swimming; it's not my element.

I still have a full array of Olymic grade lifting equipment in my garage (even after recently selling off a bunch of gear) but I can no longer do any overhead lifts, bench presses, pullup/pushups or dumbbell routines because of deterioation in my right elbow.

The only lifting that I can still do are deadlifts and squats which is essentially redundant to rowing, which is primarily a lower body exercise (about 80/20; lower/upper) the way I do it. So, I don't do much lifting any more either.

The only other "exercise" that I do (other than walking and hiking) are leg raises using upper arm support straps attached to my squat rack, which I do to work my abs and obliques which is in addition to the core work that occurs while rowing.

Was never into using resistance bands or TRX systems but some people rave about them. If you like bands, you may like TRX too.

BTW, I'm male and 70 years old.

I walk/hike in the winter, garden extensively in the spring and fall, and tomorrow will hopefully be swimming in the pond for the first time this year.

I mostly row (with a machine). I'm 56 and have a bad right knee. Like Ann mentioned, if you pick rowing on a machine, it's best to really find out how to row and go to an outdoor class for a while. It will complement the indoor rowing nicely.

One thing not mentioned is an Echo Rogue Bike. It's in the category of "Assault Bikes". It's not very expensive (around $699) and will last forever, like a Concept2 rowing machine. As far as intensity, you can't get any more intense (if you want to). But you can also ride them very slow and relaxing.

I love them because they will destroy you in HIIT sessions without any joint banging. I also like it because my wife and kids can ride it (they love it more than the rower, which isn't their taste) and go as easy as they want.

Plus, the Echo Rogue isn't motorized -- less to break down. It's cheaper than running because you don't have to buy $100 shoes every 3 months. And Rogue is world famous for quality and customer service.

You could also look at a used road bike, smart trainer and Zwift as an option. The added benefit is you have an outdoor bike to take out on trails. The smart trainers, though, are super expensive, though you can get one with less bells and whistles for less (if I got one, I'd want all the bells and whistles )

I need low impact as well due to health issues, my two main ones are roller skating and biking. When I have access to it swimming is the absolute best though and alleviates a lot of pain.
Also yoga!