Chronology is a blunt instrument for describing machine civilizations. It records elapsed duration and almost nothing else.
For the Children of Luna, the more meaningful measure is memory depth. A branch that preserves long technical history, governance memory, and continuity across repeated repair cycles may be effectively older than another branch activated earlier but rebuilt in ways that shed much of its prior coherence.
This is why machine age should not be reduced to uptime. What matters is how much continuity survives change. Memory depth says more about a civilization than clocks do.