Muscle cramps do tend to happen more readily for us older guys. I’ve found a way to greatly minimize them.  
I use Succeed S Caps. They’re an electrolyte replacement capsule. Endurance athletes use them to manage electrolyte depletion which can cause - you guessed it - muscle cramps.  
I just take two caps prior to the appointment. So far it’s worked every time I’ve remembered to take the capsules.  
It may or may not work as well for you. But it’s at least worth a try.