Some of the nuts and bolts of senior resistance training

Most senior fitness guides recommend two to three days of strength training a week. There are so many ways to do this and are worth trying.
Benefits - I am not listing all the benefits - be independent, be ablate get out of bed or chair, set off floor, slow or add muscle, (muscle means able) improve bone health, flexibility, look better, improve pain control, sleep better, live

None of these benefits happen over night and progress is slower than when you were younger. Research I have looked at suggest improvement is possible into our 90's. Actual improvement if you are working at it may be 10% or 20%. Overall with most there is improvement.

Using stars for push-ups
the lower you go on the
stair adds resistance

There are many who suggest we are slowing down the decline. Regardless how you approach this you are giving yourself months, years of active living, that would be lost if you don't do anything. Make strength training another hobby in senior living. 

Not only is she doing a push-up here
but she is working her triceps
Note the feet placement, be safe and
 or two in

Consider the various tools we can use: household stuff - cans, bottles, make excellent weights.; workouts can be done with chair, countertop, wall, bedside, bench in a park. Body weight exercises like pushups, dips, crunches, squats, lounges, heel raises, - all of which can be adapted to your abilities. My favorite example is a push up can be done standing upright doing the push up against the wall, counter, off the stairs, bench, dress of drawers, dips from a counter with your legs doing squats for support. Using a counter for balance support will help you do these things safely. A countertop with a corner is excellent for dips with your legs assisting. Try it you feel the burn in your arms. Tubes, bands are great and can be done any where. Dumbbells, TRX, going to the gym are all good ideas.

You will actually look better
My feet should an inch or two
out for a better angle. 

Where you place your feet changes the resistance. Feet closer to counter or wall is easier.
If you go to the gym to assist chin-up, dips with machines is easy. If you

my hands push up as I
do the squat 15 to 20 reps

weigh 130 and you can't lift your weight you balance the weight assistance by adding 50, 70, 100, 110 weight where you do 80, 60, 30, 20 lbs. to do the exercise. If you add 120 lbs you will be working with 10 lbs. As you get stronger you add less weight. The same is true when you use your legs to support your dips. You control what your upper body is lifting. Your legs are getting a good squat and your triceps and upper body gets a full range of motion with resistance where you will feel it.
Include discussions with your doctor who with physical rehab or trainers will work your approach. As we age it isn't one size fits all. A good plan may be completely different for you. For most of us there is a plan.

Today for me is in home walking and TRX work outs. I hope to do 3 or 4 sets. In home walking I will do three to 4 minutes at a time. Later watching a Cub game I will bike 30 minutes on my recumbent stationary bike. At my work station I will take many short walks. Add washing dishes and clean room all good for me to keep walking.