Is stable bilateral frontaoparietal white matter t2w/flair hyperintense signals, probably chronic microvascular ischemic changes called mild stroke?

Stroke. These small micro vascular changes seen on MRI are called "lacunar infarcts", which is a result of uncontrolled blood pressure for a long time.
? mini-stroke. Microvascular changes are sometimes referred to a mini-strokes but usually cause no symptoms. However, they suggest a risk of more and worse damage unless you do anything you can to lower your risk through diet, exercise, smoking cessation, and treatment of hypertension, diabetes, high cholesterol as needed.