The Timeline
Fixed. Everything downstream — every character's age in every book, and the shape of Book Three — is calculated from these three anchors. Year 0 is the Handoff, the night Book One ends.
Year 0 — The Founder's Passing. Aurelio Calder reads roughly 36 and is actually about a hundred. The Sanctuary Nine are 94 down to 6. He leaves the Assembly Plaza dying, and nobody finds him.
Year +4 — Book Two. Four years of the four using the Clearance well, then the seizure and the Sentinel. Calder is off-page throughout, in hiding, ageing normally on the Star Drifter serum: he reads 40 by the end of it. The Sanctuary Nine's youngest is 10 when the family goes down into the Deep Redoubt.
Year +5 to +65 — Book Three. The book spans sixty years. It opens close on the heels of Book Two, with everyone still young and the Sentinel's rule new — and it runs the length of a lifetime, closing on Calder's hundredth birthday in Year +65.
Ages at each anchor:
| Character | Book One | Book Two | Book Three opens | Book Three ends |
|---|---|---|---|---|
| Aurelio Calder | reads 36 | reads 40 (off-page) | 40 | 100 — dies |
| Ren | 24 | 28 | 29 | 89 |
| Selah | 22 | 26 | 27 | 87 |
| Lyra | 19 | 23 | 24 | 84 |
| Jaxon | 19 | 23 | 24 | 84 |
| Dax | 20 | 24 | 25 | 85 |
| Kira | 28 | 32 | 33 | 93 |
| Mei | 26 | 30 | 31 | 91 |
| Nova Ashgrove | 31 | 35 | 36 | 96 |
| Nine — youngest | 6 | 10 | 11 | 71 |
| Nine — eldest | 94 | 98 | — | — |
Who does not reach the end. Vance would be 123, Vael 127, Harlow 125, Thaddeus 132. All of Book One's older generation is gone well before Book Three closes, and the eldest of the Nine does not see the Redoubt for long. Whether Ren, Selah, Lyra and Jaxon live to the last page is deliberately open — they are in their eighties, and the series does not owe them all a survival.
The Star Drifter is 65 years older at the close than at the Handoff, on a longevity treatment cruder than Calder's. Very old, and not dead, exactly as intended.
Why Calder's hundredth is the right ending. A hundred is his body's age, not his lifespan — he crossed 6.5 billion miles, spent three decades awake in a cryogenic bay, and ran four decades at forty per cent under a field. Nobody can add that up, including him. So the series closes on a man who spent forty years documenting everything about everyone, dying at an age arrived at by consensus, at a party thrown by people who decided to agree on a number.