Hillary just used a hammer.

Correction: One does not actually extend their life by slipping into a different potentiality quantum wise. They simply are propeled into a future because they stepped into a vorticies surrounding a microscopic black hole of stopped time. Some unfortunate souls are lost forever (to us) but most just enter at a perfect tangent which allows for an expulsion into a new time line. While no time passes to the happless wanderer, confusion or psychosis can sometimes occur. In 6 billion years many have taken this strange journey without harmful consequences so don't worry, it is a rare event and probably won't happen to you. However real dangers arise when the vorticies grow up to a quarter mile sphere under ideal circumstances.

For the vast majority only seconds to hours are 'lost'. A few of the miniature black holes are tidally locked and are deliberately accessable. Most travel at various speeds or in subterrainean orbits one would never encounter.

So lifespans remain the same no matter how many jumps are innertaken/undertaken and overtaken. Sorry for the confusion.

If you encounter a nebulous ball of dark soft light, it is best left alone.