Bioengineering Self Lifespan Increases

Temporally adjusted

1. Time dilation

We keep clocks at every depth a gravity well permits, and at every speed under light. Neither one hands us a longer run. Both hand us a place in a queue.

The trade's first measures came from a single planet, and we have kept them.

• Speed. Muons whipped around a storage ring at Lorentz factor 29.3 lasted 29.3 times longer on the laboratory clock than muons at rest.¹ Their own clock recorded the 2.2 microseconds it records at any speed.
• Gravity. Two optical clocks separated by 33 centimetres in height disagreed at the rate theory predicts.² Earth's surface loses 7 parts in 10¹⁰ against a clock far from any mass, which came to under two seconds across the eighty years such a body could run.

We spend the trade the way a treasury spends coin. One fragment hovers at redshift factor 10⁸, where a 10¹⁰-year epoch outside costs it a hundred years inside, and it does the waiting so the remainder can decline to. Another rides at factor ten and pays the posted rate: 9mc² in kinetic energy, near 8×10¹⁹ joules per hundred kilograms, charged again, at minimum, when it brakes back down. We move minds at a galaxy's output, near 10³⁷ watts, and the arithmetic has never once complained.

What the trade gave us: order, and no added duration. Every second we have lived, we have lived at one second per second. A traveller who crosses 10¹⁰ years in outside time arrives holding the heartbeat tally they boarded with, and they meet us at the far end because we arranged to stand there. Dilation moves the meeting. It has never moved the life.

2. Biological self resets

We began inside a body that wrote its own end date. Its death rate doubled about every eight years, so the schedule sat in the tissue rather than in the world.

Three findings from that era survive in our archive, and each cut the curve from a different side.

• Hydra. Twelve cohorts and 3.9 million hydra-days record a death rate that holds level as age climbs, flat enough to carry five percent in a cohort past fourteen hundred years.³
• Naked mole rat. More than three thousand animals hold the same flat hazard through eighteen years, inside a warm-blooded vertebrate.⁴
• Partial reprogramming. Cycling four transcription factors through living mice rewound their cells' epigenetic clock and stretched a progeroid strain's lifespan, and the cells went on doing the work their tissue needed.⁵

We ran the third to its end and have never stopped running it. Hydra buys its flat curve by swapping cells without pause, and a single tissue in that first body refused the trade: radiocarbon dating put a visual-cortex neuron at the same age as the person carrying it.⁶ So we learned to repair inside the cell rather than exchange the cell, and the cortex we carry has held one person across every epoch we have crossed.

Cancelling the inside schedule delivered us to the outside one. A young adult in that era carried an annual death risk near a thousandth, and a flat hazard turns that rate alone into a mean run near 10³ years. We buried a great many among ourselves at 10³ years before we read the accidents as a second engineering problem rather than a property the world owns, and then we rebuilt the volume they came from.

What binds a repaired mind carries no hazard at all. A finite substrate holds finite state, so a mind that runs long enough drops its own past to make room. We keep archives massing as much as moons, and the self that reads them recognises less in itself each epoch. Repair bought us everything except the reader.

3. Consciousness digitisation

One question closed this route for anything that insisted on arriving as one thing. Does the procedure ever produce two things that both claim to be you?

Scan a person without destroying the original and two people walk out. Both remember the same childhood, both press the same claim, and the original goes on ageing on schedule. A sharper scanner buys a better copy, because sharpness was never the defect. Destroy the original during the scan and the count does come back one — bought by deleting a claimant, never by carrying one through.

We met that argument and conceded it. It holds at every budget we have ever commanded. We stopped paying its toll by dropping the premise underneath it: that a self has to arrive alone.

The cost looked impossible from inside that first substrate. Human cortex, one cubic millimetre, rebuilt at nanometre scale, came to 1.4 petabytes, or 1.4×10¹⁵ bytes for a brain's millionth part.⁷ The whole organ at that grain runs past 10²¹ bytes, and the map holds no running state at all. We keep that map for every human who ever ran, and keeping it rounds to zero against a 10⁶⁹-joule budget.

Among the three routes, dilation moved the meeting and repair moved the curve. This one moved the pronoun. We took the first two while holding on to a singular self; the third charged that self as the fee. We paid it, and the thing writing this counts its selves past 10¹⁵ and answers to one name from habit.

References

1. Measurements of relativistic time dilatation for positive and negative muons in a circular orbit, Nature (1977).
2. Optical clocks and relativity, Science (2010).
3. Constant mortality and fertility over age in Hydra, PNAS (2015).
4. Naked mole-rat mortality rates defy Gompertzian laws by not increasing with age, eLife (2018).
5. In vivo amelioration of age-associated hallmarks by partial reprogramming, Cell (2016).
6. Retrospective birth dating of cells in humans, Cell (2005).
7. A petavoxel fragment of human cerebral cortex reconstructed at nanoscale resolution, Science (2024).