An extended lifespan will be useful for interstellar space travel. If the voyage to a star takes two hundred years, it would be good if some of the passengers who embarked could actually finish the journey - not just their great-great-grandchildren.
It’s somewhat alarming to ponder just how a baby would form in the womb, let alone grow through childhood and into adulthood in zero gravity. Spidery limbs, generally weak and wan but with a big head, probably. Sounds familiar, lol.
If you remember Genesis, the early people had extended lifespans, right up until the flood. Something changed then that put a hard limit on the normal life expectancy.
If someone could unwind what happened, they could compensate for it possibly. It would be an interesting problem to try and unravel.