The just comes a point when living with the status quo is no longer an option. If one can cook, they can do it any type of kitchen, but bending over, or getting on your knees to reach food or cookware just gets harder to do as one ages.
There are many ways to cover a window. If you are looking for the best solution first ask what is the purpose of the covering or treatment. Is there a need for light control, privacy, decoration, sound absorption, some, or all of the above?