Cupboards

Because we completely re-did the kitchen in the suite for my parents - I was able to create an accessible cabinet plan.  There are no lower cupboards, just deep, large pull out drawers.  Plates, pots, all the heavy things are down in the drawers, with the upper cupboards being spices, food, etc. 

To make an existing kitchen more accessible: 

Add slide out drawers or trays/ pull down shelves to existing cabinets for better access.  

None of these options are cheap but they ARE cheaper than all new cabinets!

Store frequently used items in easy-to-reach locations to make daily tasks easier and utilize lazy susans for those hard to reach places or extra deep cupboards like this:

Or if you don't have thousands to spend - a product like this could work.   

I do not personally have these as I live in the same house and do most of the cooking here.  But these are a decent price and have lots of good reviews.

Another option is something like this:

It appears you "teach" it the sound of your smoke detector and if it hears it, it shuts the stove power off.  Again, I don't have one so I can't vouch for it.

Another product I found (but have not tested) is:

It works by detecting motion while in front of the stove, and if there is none after a pre-set time, it turns the burner off.

Under cabinet lights are recommended for better visibility while working on the countertop. I like these; they have good reviews, and I like that they can be on as a task light, and also be set to motion detect at night.  A 2 hour charge lasts a significant time (depending on use) and no batteries to have to swap (built in rechargeable).

Two door (side by side) refrigerators tend to be easier for seniors to open.

Install a fire extinguisher in the kitchen for immediate access in case of a fire. The one I went with has over 35,000 reviews and an almost perfect 5 rating.  Its a little more expensive BUT is good for wood, paper, trash, plastics, gasoline, oil, and electrical equipment fires    

I also added one of these beside the stove (the most likely place for a fire).  

They are very easy to use - pull tabs, unfold and throw on top of fire... that simple! and without the mess of a conventional extinguisher.

I like this one cause it's highly rated while not being as thick as some (read - less trip risk) and Mom likes that it isn't straight black! 

 A kitchen stool may be recommended depending on the needs of your Senior for comfortable meal preparation 

Mom gets very uncomfortable sitting on my wooden chairs at my dining table.  Consider some nice cushions to make sitting more comfortable.