Took speed and other weird stuff during hippie days. What causes this blood vessel problem I have at 60?

Drugs and lifestyle. "speed and weird stuff" are accompanied by unhealthy lifestyle that lead to a vicious cycle the hurt all body systems (mental-neuro-cardio-vascular-endocrine). Never too late to adopt a better lifestyle to hope to have better less suffering end-of-life days.
Blood vessel damage. Age, genes, smoking, poor food choices. The older you get, the more your blood vessels will age, show damage, especially if you have elevated cholesterol, diabetes, hypertension, obesity. Smoking causes premature blood vessel disease, as does a diet rich in fats and processed carbs. The only thing listed you cannot control, improve, or change is your aging genes. Work on the others.