It's a pretty common occurrence in older persons, particularly. It is almost common enough to be called endemic. It develops "silently" and in the case of Trump, it was discovered through a thorough physical as he had not demonstrated the notable symptoms which occur at a slow, slow pace.
I have the same thing, and it was discovered when doing a physical and tracking of back pain. I did not know I had the condition, and five years later still don't feel or sense any of the symptoms. I was told by my physician "it's the least of your worries, tied by being gored by a mountain goat." To that was added, "almost all my patients have it to some degree and they outlive the side effects."
A similar situation is prostate cancer in men over 70 or so. Such a huge percentage of men have incipient signs of that and the progression is "slower than overall aging" nothing is done or needs to be done.
I can answer both of these as I just came from my post-operative 48 hour review with my surgeon and GP and I took advantage of having them both present to ask about CVI and its comparison with prostate cancer since I had just read about this.
Google's AI response is:
"Chronic Venous Insufficiency (CVI) is a condition where the veins in the legs have difficulty returning blood to the heart, leading to pooling of blood in the lower limbs. It's more common in older adults, and while it can affect men, it's slightly more prevalent in women. Risk factors include age, obesity, prolonged standing or sitting, family history of venous disease, and previous leg injuries or blood clots"
Overall, chronic venous insufficiency affects about 1 in 20 adults. As age increases, the percentage of people affected increases. In that sense, it is nearly as common as arthritis among older people. It has no effect on mental capacity, and "CVI usually isn’t life-threatening and doesn’t result in amputation. But it’s a progressive disease that can cause discomfort, pain and reduced quality of life."