There’s a good book by John Scalzi called “Old Man’s War” that’s worth looking up. It’s about a future where they take old people, and transplant their brains into young bodies, for use in Space Battles (thinking they are old/wise/intelligent, but with new healthy bodies). It’s a deeply philosophical book (despite being somewhat funny at times), that jam a bunch of the above tropes together.
There’s a good book by John Scalzi called “Old Man’s War” that’s worth looking up. It’s about a future where they take old people, and transplant their brains into young bodies, for use in Space Battles (thinking they are old/wise/intelligent, but with new healthy bodies). It’s a deeply philosophical book (despite being somewhat funny at times), that jam a bunch of the above tropes together.