My Dad is 86 and I've noticed he is having trouble keeping his eyes open. His Mom lived to be 109 (that's not a typo). She had surgery at 86 and never really was "right" again. She had trouble opening her eyes that got progressively worse until she passed. What causes this? Is this dementia coming on? He seems to be getting sun down dementia, maybe? Falling asleep at the table and seems disoriented later in the day/evening.