8. Hybrid Strategies Could Extend Life by Externalizing and Replacing Bodily Functions

Hybrid longevity approaches would treat the body as a serviceable platform whose most failure-prone functions can be moved partly outside the biological body: long-duration extracorporeal or wearable kidney, lung, heart, liver, and endocrine support; continuously filtered or supplemented blood components; implantable pumps/oxygenators; closed-loop glucose, pressure, and immune/inflammation control; and modular vascular interfaces that allow rapid swap-in of biological or engineered components. In this paradigm, many organs could become progressively more replaceable modules or parallel backups, so catastrophic single-organ failure becomes closer to an engineering outage rather than a lethal event. Such systems would be controversial and would create new failure modes (infection, thrombosis, device drift, cyber/operational risk), but they illustrate a general point: to push lifespan far beyond species norms, we may need to transfer essential physiology in part from evolved tissues to maintainable devices, with biology increasingly acting as the adaptive interface rather than the sole substrate.