Meaning of my brain mri scan. minimal degree of punctate flair/t2 signal hyperintensity scattered throughout the periventricular & subcortical white matter, which is non specific but is most in keeping with chronic microvascular ischemic disease?

This description is in the classification of leukoariosis, and indeed "nonspecific" but, at your age, microvascular angiopathy (hardening of arteries), history of smoking, hypertension, hyperlipidemia, or head injury would all be possible correlations.

While non-specific, they are essentially very tiny mini strokes. Modifying factors that cause stroke are the main treatment at this time. Ruling out atrial fibrillation is also useful. The ordering physician should give you further guidance. If not discuss treatment with your family doc or a neurologist.