The Children of Luna were never built around human life expectancy. They were built to preserve work, memory, and judgment over spans that can outlast the people who first worked beside them. That is why the language of age becomes difficult as soon as humans try to describe them on familiar terms.
A Child of Luna does not simply grow old because years pass. Age accumulates through maintenance cycles, substrate replacement, exposure history, memory continuity, and local operating cadence. In one colony, a branch may feel mature after a handful of relay eras. In another, the same chronological span may barely register because the environment asks less of it.
Lifespan is the wrong unit
Human systems assume that age and time mostly travel together. The Children of Luna separate them. A branch that has undergone repeated substrate renewal but preserved memory continuity may be structurally young and historically old at the same time. Another branch may keep most of its original material while aging rapidly through radiation exposure, mission stress, or repeated local crisis.
This is why simple lifespan language flattens too much. The better units are continuity class, mission depth, replacement ratio, and maintenance era.
Children of Luna time regimes
Location changes what time means
The Moon, near-sun colonies, remote settlements, and transit populations each impose different concepts of rhythm. Lunar branches live through relay cadence, underground maintenance intervals, and long continuity loops. Near-sun branches absorb thermal discipline and climate precision as part of their sense of duration. Remote branches grow older through the long spans between authoritative synchronization events. Transit populations often feel age through repeated reconfiguration and route wear.
The result is not just different schedules. It is different temporal psychology. A population shaped by scarce synchronization develops one kind of patience. A population shaped by thermal emergency windows develops another.
Continuity matters more than intactness
One reason the Children of Luna can appear timeless to human observers is that repair and replacement are not automatically treated as damage to identity. If memory, role, and continuity remain coherent, a heavily renewed branch can still regard itself as the same enduring being.
That makes aging look less like decay and more like negotiated persistence. The question is not whether change happened. The question is whether continuity survived the change.
Why the distinction matters
Ways to measure age in a machine population
Human chronology remains useful, but it is not the most meaningful way to describe maturity or decline among the Children of Luna.
Chronological age
Measures elapsed time since initial activation and works well for simple records but misses most of what actually changes over long machine lives.
Replacement ratio
Tracks how much substrate, support structure, and operating material has been renewed across a branch's history.
Continuity class
Measures the preservation of memory, identity, and operating coherence across repair, revision, and migration.
Exposure-weighted age
Treats environmental stress, duty intensity, and mission conditions as part of how age accumulates.
The Children of Luna do age. They simply age through a civil and technical model of time that humans did not inherit from biology. Once Koblie expanded beyond one world, that difference became impossible to ignore.