No suggestions for exercise - walking, resistance training, stretching?
If I took these suggestions literally, I'd have to stop doing aerobics.
Here's another suggestion, based on what I've seen people in their 90s doing:
1. Mini trampoline. That alone contradicts almost every suggestion! Bouncing, twisting, jumping, at least 10 minutes a day.
2. Walk walk walk walk. Don't sit to long, walk. If you live near hills or mountains, "climb" - at least, practice walking up steeper and steeper hills.
3. Start with 2 pound weights if you've never done it before, but most folks here should be able to get up to at least 6 to 8 pounds.
If you're not sure what to do about strength training "Fitness Blender" has hundreds of free videos on YouTube. But you don't have to watch much. if you search "10 best strength training exercises" you'll get about 90% agreement. Just work your way up to that.
4. Stretching. Same as with strength training. Theres' maybe 20 stretches - at most - you need to do regularly, and really, if you look for the 10 best and do those every day, you'll be fine. Sound like too much? Look up chair yoga.
Now you have no excuse. Get a pair of 2 pound dumbbells, put them on the couch next to you when you watch TV. Get your chair yoga book, and make sure to get one that includes aerobics.
You can do aerobics (seriously), strength training AND stretching (and even balance exercises - important for seniors) while sitting on the couch.
And since Americans over 65 watch an AVERAGE of 4 hours of TV every evening, you've got time. Just try 10 minutes every evening.
And when you get really good, get off the couch and try exercising outside, with other people.
Stave off falls, dementia, depression, increase energy, clear your mind, be happier - all of that from just starting out with 10 minutes a day on your couch!