I think I would also go with the mind for exactly the reasons ithilin stated.

That's a really good point! At first, I thought that I'd go with body, as my family has a history of not getting dementia/Alzheimer's/becoming senile, but you make a great point that in the future, having a good body won't be necessary.

I hadn't even thought of that! Indeed, with the way technology is advancing, having a clear mind in old age would open up new ways of experiencing life.

What kind of VR are you thinking of? Like the oculus but more sophisticated or perhaps a whole room than tranforms into another world?