Hi, I am in the process of setting up an elder/senior care business. Would someone be so kind as to give me some ideas for products to sell? I am looking for the most sought after products by seniors, most purchased, most useful, etc. Thanks for your valued input!

Welcome in Tappers.
My strongest suggestion would be to read some of the issues we face, often times we give ideas of many products we come across to make our lives easier in some way.
But the main reason I wish for you to read here is simply because you will have a better understanding why we use some of the things we employ in our day to day care.
There are far too many products for each issue we have and what works for one may not be appropriate for another you know what I mean?
There are standard needs like lifts commodes washable mattress pads and incontinence underwear that are basics and thats only a few off the top of my head.
There are medical instruments we use daily BP monitors O2 meters thermometers etc.
The list can go on.
Take the time to read in Daily challenges that have to do with hands on caregiving and also Safety issues it will go a long way for the success of your venture