Vascular dementia is going to happen if you exercise or not. Exercise is great for a lot of reasons. But vascular dementia has more to do with body chemistry.
My LDL is higher than normal. But I refuse to take statins. I don’t even get out of breath climbing stairs to 3rd floor of my condo building. And still writing computer programs to monitor my investments. Not even close to dementia at age 83. Regular Exercise is my key to staying physically and mentally healthy. Not taking any prescriptions except minimum dose Lisinopril 10mg.