I just turned 50 and have also recently started the guitar journey. I don't have a fix but the way I face similar challenges (finger stretches, cramps, wrist pain, etc...) is understanding that other people have had the same issues and gotten through it somehow. As crazy as it may sound that thought gives me comfort and motivation. I find each day the main issue I previously faced diminishes even though sometimes it is ever so slightly.

Sometimes the journey is the destination.