Creation/evolution hermeneutics History Physics

Age as a quality factor of human life after the Flood

The concept of decreasing human life spans after the Flood is considered by analogy to a quality factor that one observes in physical systems. It is found that the concept is not inconsistent with what we observe from the decreasing life spans of the Patriarchs listed in Genesis. (This article is a bit mathematically technical. It is really just speculation but I found very interesting. Edited from an article first published online here.)

In physics we define the quality factor (or Q-factor) of a system using the time it takes for it to dissipate 1/e of its energy. If we then look at human life spans in terms of a quality factor we would all have to agree that length of life or age at death defines a sort of a quality factor.

One researcher examined entropy of living systems and concluded that essentially we die because we come into thermal equilibrium with our environment at senile old age.1 This is where we can no longer generate enough heat to sustain life in the body and we die.  So to live a long time means we have some sort of higher quality factor and it takes longer for the state to arrive where the cells in the body can no longer generate enough heat. This is of course what entropy is all about. Living things are complex systems and while functioning properly are highly complex low entropy systems.

This concept is not incompatible with the ideas of genetic entropy, nicely described by John Sanford.In that case death comes sooner in a population due to the accumulation of genetic damage.  Considering only senile death, it is conceivable that as the number of generations an organism (humans in this case) passes its genes onto the next generation the genes within the surviving population accumulate genetic defects (mutations) and this results in an increase in genetic entropy. Hence in the individuals in the population death progressively comes sooner as they are not able to sustain life as long as their parent before them.

Figure 1: Ages of the patriarchs plotted at the time of their birth since Creation.

In light of the above, if we look at the ages of the Patriarchs listed in Genesis, chapters 5 and 11, we may get a new perspective. In Figure 1 I show their ages, plotted at the time of their birth, both before and after the Flood. The Flood is indicated in the year A.M. 1656.3 Also I have included 3 additional points at A.M. 3000, 4000 and 6000. These indicate, respectively, roughly the time of David, of Christ and the present day. The age indicated at each point is 70, the three score and ten years spoken of by Moses (or Ps 90:10).

At this point let us define the quality factor for human life in analogy to that we do in a solid state system in physics. In a crystal we look at the energy dissipated from the system and the Q-factor is defined in terms of the total losses in the system. That is

Q = 1/L,                                                                                                     (1)

where L represents the losses. In the case of human (or any) life the losses represent the energy lost from the system integrated over some finite period of time.  This definition is in the context of senile death, not due to accident, disease or being taken by God meaning not seeing an earthly death.

From Figure 1 we can immediately ignore Enoch because he did not die in the normal way.  Then let us now plot the reciprocal age of the patriarchs, which represents a measure of the losses in their bodily systems (the reciprocal of their Q-factors) and the result is shown in Fig. 2.

Figure 2: Reciprocal ages of the patriarch from Genesis as a function of the time of their birth in years from Creation.

You will notice of course a high quality factor means low loss of energy per unit time. So the pre-Flood patriarchs have high Q-factors and low losses; post-Flood it is a different story.

To the data I have fitted the best fit curve4 given by

L(t)= 0.014286 – 0.312344.exp(-t/τ) ,            (2)

where L(t), a function of time in years, is the reciprocal ages of the patriarchs.  All values were determined as free parameters from the fit. And the time constant τ = 518.06 ± 3.44 years means the losses in the human system increased by a factor e (the natural base ≈ 2.71828) over that time period.

Therefore using equations (1) and (2) you can calculate the expected age of anyone born at any epoch after the Flood, in years A.M..

In order to take into account the pre-Flood world we can see from Fig. 2 that they have losses also, though much smaller that the post Flood worldlings. Hence their very long ages. Excluding Enoch and Lamech they average 935 years. If we use this as a constant loss we can draw a horizontal line at 1.07 × 10-3 in Fig. 2, which has been reproduced as Fig. 3 on an extended log-log scale.

Figure 3: A log-log plot of reciprocal age verses the time of birth since Creation. The first point at 6 days into Creation is Adam.

Figure 3 shows the same data (excluding Enoch) where the fit curve (2) shown as the broken line becomes almost vertical as it approaches zero.  I speculate, that during the period of time before the Flood and after the Curse, God sustained the decay processes at a constant level in the pre-Flood worldlings bodies so that they lived a long time but not millions of years as the reciprocal of the broken curve in Fig. 3 would suggest.

This means God added additional losses after the Curse so that the body system losses were held roughly at a constant until the Flood.  This is another way of saying that even though genetic entropy was already increasing after the Curse the losses from that were very small in comparison to some predetermined level that God had set in the antediluvian world. These larger yet constant losses could have been due to a genetic mechanism (as yet unidentified) but extremely small by comparison to the currently very large and ever-increasing losses.

Incorporating this hypothesis we must add the pre-Flood loss line (solid horizontal line) to the  post-Flood loss curve (broken curve) to get the corrected equation.

L(t) = 0.00107           for t < to,                                                                                                      (3a)

L(t) = 0.00107 +0.014286 – 0.312344.exp(-t/τ)  for t > to,                                                                                                      (3b)

where  to represents the time, t, where the two curves cross in Fig. 3.   It is a piecemeal curve that incorporates the worldling age losses, before and after some critical time where a significant event occurred.

By solving equation (3b) for its root we find it goes to zero at A.M. 1560.72 ± 10.36 (statistical 1σ errors). What is interesting here is that this is determined completely from the three free parameters in the fit to the post Flood data. You may also notice that adding 120 years to this figure, the period of time Noah spent building the Ark, you get A.M. 1680 ± 10. This is in pretty good agreement with the date for the Flood from the Masoretic Text used by modern Hebrew Bibles.5  If we use equation (2) instead for this calculation we get A.M. 1718.12 ± 11.40.

So my speculation here would be that at some point near the time of the Flood, or at God’s call to Noah to build the ark, a decay process overtook in the bodies of the inhabitants of the world then and the case is continuing the same now. This decay process started in the Curse but due to God’s sustaining power was not manifested. With increasing losses (or decay) there has come about a decrease in quality factor, which could be driven by genetic decay, and hence a decrease in age.

If one extrapolates the broken line in Figs 2 and 3, it becomes negative for times less than A.M. 1560. In physics a negative loss means amplification, or regeneration, which means no losses at all.  Possibly this was the state of Adam and Eve in the Garden, before their Fall from Grace. They lived in a state where the thermodynamics was operating but where the losses were constantly being cancelled by a regenerating force of God—God sustained His Creation, just like He did in the burning bush on Sinai.

Equation (2) is the same as we observe in a semi-conductor that initially is very cold and in darkness and is illuminated by light. The light liberates electrons trapped on defect sites in the material, which results in an increase in conductivity and hence losses.  Maybe there are some parallels there also. God has illuminated our hearts through the progressive revelation in His Word, and though we now have decreasing age and hence quality factor, we are drawn “out of darkness into his marvellous light.” (1Peter 2:9)


  1. Hershey, D., Entropy Theory of Aging Systems, Humans, Corporations and the Universe (Imperial College Press, London, 2010)
  2. Sanford, J.C., Genetic Entropy & the Mystery of the Genome. (Ivan Press, 2005)
  3. A.M. = Anno Mundi = year of the world or since Creation.
  4. The curve fit statistics χ2 = 5.68 × 10-6 and R = 0.9897.
  5. Sarfati, J., Biblical chronogenealogies, Journal of Creation 17(3):14-18, 2003

Recommended Reading


By John Gideon Hartnett

Dr John G. Hartnett is an Australian physicist and cosmologist, and a Christian with a biblical creationist worldview. He received a B.Sc. (Hons) and Ph.D. (with distinction) in Physics from The University of Western Australia, W.A., Australia. He was an Australian Research Council (ARC) Discovery Outstanding Researcher Award (DORA) fellow at the University of Adelaide, with rank of Associate Professor. Now he is retired. He has published more than 200 papers in scientific journals, book chapters and conference proceedings.

One reply on “Age as a quality factor of human life after the Flood”

Theologically, the reason for different life-spans pre and post Flood could be that God made different covenants with people before and after the Flood, subject to different contractual conditions, resulting in different physical outcomes.


Comments are closed.