Children with older fathers live longer.

The telomeres (the tips of chromosomes which protect them from damage) in sperm cells grow with age, unlike those in other cells, and that added protection is passed on to the children.  Yes, older fathers increase the risk of miscarriage, but scientists think that the health benefits outweigh the risks.

“As paternal ancestors delay reproduction, longer telomere length will be passed to offspring, which could allow life span to be extended as populations survive to reproduce at older ages.”

Many future fiction has a humanity with greater lifespan than at present.  Is this one of the methods we will use to achieve it?