We usually discuss aging medicine and organ transplantation as separate fields.
However, this diagram shows that they are in fact interventions applied at different points along the same trajectory.

In the early phase, aging progresses silently.
Cellular resilience declines through mitochondrial dysfunction, impaired repair capacity, and immune aging.
At this stage, organ structure is largely preserved, and functional reversibility still exists.

The dashed line in the center represents a reversibility threshold.
Crossing this boundary marks a qualitative shift—from modifiable dysfunction to irreversible organ failure.

Aging medicine aims to intervene before this threshold, by maintaining cellular energy, repair mechanisms, and immune balance.
In contrast, transplantation intervenes after reversibility has been lost, replacing organ function rather than restoring it.

Both approaches are essential, but they operate on different temporal domains.
The increasing demand for transplantation therefore reflects not medical progress alone, but also the accumulation of upstream failures in aging control.

This timeline highlights a key principle:
preventing irreversible decline may ultimately reduce our dependence on organ replacement strategies.