Well cloning and artificial wombs are basically done or very close, we just haven't applied it to humans due to ethical reasons. Six years ago there was already a very premature lamb kept alive in an artificial womb for four weeks.

As for cancer and aging...it seems increasingly clear that part of the process is just that genes necessary for development get dysregulated later on in life. I think the fact that we can rejuvenate our own cells by making sperm and eggs points to the fact that the dysregulation should be fixable, and recent advances in aging research seem to show that this is true. The issue is, of course, pushing that process too far and ending up with cells dedifferentiating or becoming cancerous, but I think it's possible if we're careful.