It would probably be best to get medical help
The process of reporting possible signs of dementia within agreed ways of workings usually works like this - a physician would receive a patient and view his symptoms - he would check for his memory capabilities and his decision-making style. If he would see that the patient exhibits certain memory deficits, this would probably warrant further investigation whichcould lead to a dementia diagnosis.
His mother could encourage him to wear sunblock and sunglasses.
It would be a I'm pretty sure I found that out online
