Yes, however we’re also able to take the age of the universe with respect to the rest frame of the cosmic microwave background. This is the age commonly given when someone asks the age of the universe. From the perspective of Earth, the universe is about 250k years younger.

What kind of dementia are you referencing? There are over a dozen different subtypes of dementia, each of them with varying symptoms and degrees of severity.

I think you could learn a lot by reading about dementia and the subtypes (Alzheimers disease, vascular dementia, frontotemporal, etc.) and how they impact the brain.

Also, no posts about religion. Thanks!