As one who is over 60, and having experienced medical problems on at least two Caminos, I developed a habit that is now part of my regular preparation leading up to my next Camino, or volunteer work. I am in the habit of having a annual, full physical examination with full blood work panels each December, my Christmas present to ME.
Also, each January I have my annual eye-exam and refraction, so new eyeglasses can be obtained timely. Each March, I have a full-body dermatological exam, a semi-annual dentist visit, and semi-annual blood labs and ultrasound exams for my chronic wonky liver...
Also, this coming January, as a one-off thing after a year of "watchful waiting" I am having a bionic eye installed to replace a growing cataract in my left eye. Actually it is a Bausch & Lomb "Crystal Lens" adjustable contact lens to replace my cloudy natural lens. This lens works both for near vision and intermediate vision. I will still need a distance lens for driving, but my right eye requires progressive bifocals anyway.
This necessarily means that, when Camino season (for me) starts in April, I am "good to go."
I offer this, arguably perhaps TMI, merely as a means to compare preparing your Camino "vehicle" - your body - much in the same way you would prepare your car before a long, multi-day journey. if you simply add gas / petrol and speed down the road, are you surprised when you have a flat tire or another mechanical breakdown to spoil your holiday? Preparing your body to undertake both long distance travel and a Camino is no different, at least IMHO.
As many of us have these preventative medical visits routinely each year, consider shifting the dates to more closely comport with your planned Camino activities. In my view, this works best if you, like me, stick to Caminos during the "hip periods" of April - early June, and September - October.
I hope this helps.