My father of 52 years mri report's " infovour of tiny infarcts within frontal lober of both cerebral hemispheres' is it serious ?

Risk factors: Do not understand the hedged verbiage on the report, but the findings, if real, suggest a strong risk of future significant strokes, and the underlying causation needs to be treated and controlled. Problems include hypertension, high blood fats, diabetes, and smoking. Medicines to prevent strokes are readily available. See a neurologist asap.

Aggressive medicine: These are signs of disease in the blood vessels in the brain. It may be atherosclerosis and all its complications. The process takes years to cause problems and has no symptoms. He has to look at all his risk factors (age, sex, metabolic), take all the preventive measures (diet, exercise, meds) and he has to have lower than normal blood pressure, lower than normal cholesterol etc . Talk to the doc.

Difficult to tell: It sounds like that there may be a number of small changes that are not clear enough to raise a specific diagnosis. Small strokes in someone who is 52 years old is not something i would necessarily expect and i would recommend further workup and the appropriate treatment.