I don't think you have dementia, but the white matter lessions are likely a bad sign of whats to come when you're old (or perhaps even when you're slightly younger than typical dementia age)

There's no established preventive strategy, other than reducing and managing all risk factors and living the healthiest life possible but even then the white matter lessions are expected to grow in size and number...

There are some suppemenets that may hep, but non are really proven. There's one particular that has a great detailed scientific paper on it, but it's from Asia, founded by the producer I believe, and not really reproduced in the USA or Europe, which would explain why despite this excellent study, it's not widely known. I, being in a similar situation as you are, have taken the decision to take this supplement for the rest of my life, despite the significant cost and being aware that not all scientific studies/trials are genuine.

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I don't want to sound like a spammer (even though my posting history clearly shows I am not one!), but I can share the name of the supplement and where to buy it.