h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

If everyone can survive, where do we get the necessary space to house all these people? This would almost certainly mean reducing the birth rate strongly, having ageing of the population as consequence.
Besides, living with some people for short times, can be tiresome, but just imagine living at close quarters (our planet will become crowded) for billion years with these people!

Given near immortality it becomes more realsitic to consider colonisation of other worlds giving plenty of living space.

Quite right...
What would happen to the inventivity of the population? You would have "old" people tired of new inventions, and restoring their mind to a more "youthful" attitude would require to use old backups, losing their experience in the process... (am I making sense here?)

Wouldn't it be possible to upload the emotion of youth separately to uploading experience.

Might be worth readin Kim Stanley Robinsons martian series
By the end of that life expectancy is at least 1000 years

I've got an interesting theory on evolution.

Because humans have 'outgrown' evolution, we've come to a dead end. Natural selection no longer happens to us, especially in the affluent west. For example, people suffering from an inherited disease now have no less chance of getting a mate than anyone else.

Instead of improving our intelligence, reflexes and physical skills, the only thing natural selection might be doing is selecting the genes of good looking people.

There's not much we can do about this in my opinion. Our own moral system tells us that only allowing intelligent, strong and well-balanced people to produce offspring is inhumane.

Evolution doesn't stop. Only the selection pressure changes. It used to be that the bigger and stronger you were, the better chance your genes had (and this is probably still the case today, to some extent) but now other factors are just as important. I'd be surprised if people weren't (on average) funnier than they used to be, given that virtually every poll taken on partner preferences puts 'makes me laugh' quite high up.

And actually, inherited diseases still play a part, since people tend to be having children later, so only those diseases that take hold later in life will survive (which is what's always happened).

The big problem is, once you start thinking about directing evolution, you're starting down a very dangerous path.