https://www.youtube.com/watch?v=p-VDVI1GMZk
Apparently they are touring together. This is cool.
His dedication to Alzheimer's and obsession with exercising the brain tells me that...he's probably got a pretty close family member with this disease, or had one. Or that he's possibly worried about being genetically susceptible and his efforts are designed to stave it off. Or none of that.