Usually if 55 or so they tend to allow for age related issues, since closer to retirement age..

If you feel atty is lacking I believe you can change for another one..
might be worth searching for info on that..
Sometimes they want to know what the dr says person can or cannot do.. if no driving at all the dr can say that in report..
If shaking & weak and fall risk, that needs to be stated, has he fallen and gone to ER or dr for a check up after that., that is good for the record aspect..

You might explore our PD forum also..for help on meds & side effects and such..

As my dad got into his 80s w/PD additional meds had to be reduced & finally stopped due to effects and some weren't working anyway..so why take them..
His body could not process the mix i think..

Depending on what your dh meds are for, might be good to evaluate what is really needed, or not working, or too many SE (side effects)..