I think that as people live longer they will have less children as a result, simply because the inner need to procreate and keep humanity alive will die down. W

I think that as people live longer they will have less children as a result, simply because the inner need to procreate and keep humanity alive will die down. We see this in the differences between the first world and third world countries where mortality rates have a significant delta. For instance, In Africa they tend to have more children on average than they do in Europe.