I wonder if this could be generally true.
A natural process working properly has a normal distribution of outcomes. Given aging or any other form of degeneration, the normal distribution breaks down and begins to look bimodal, trimodal, etc.
The normal distribution was due to an appropriate balance among the bimodal competing tendencies (really two normal distributions that overlap and coalesce to make the resulting normal distribution). That normal distribution breaks down and one begins to see the bimodal emerge.
When three or more competing processes equilibrate to make a single normal distribution, breakdown can lead to bimodality, trimodality, etc.
Can the rate and extent of breakdown of normality toward bimodality in reference processes be used to age an organism, or at least to assign relative ages?
An example of what I am talking about – consider the difference between normal stool in healthy individuals in which nature finds the balance of water, solids, and motility to produce something that moves easily and almost effortlessly through the bowels, while maintaining enough hydration for the rest of the body and the kidneys to function well also. Consider what happens with inflammatory bowel diseases, in which there are periods of diarrhea and periods of constipation -often roughly equal in numbers and durations – and few “normal” days as far as stool is concerned.