The Sunset of Dimorphism: Why We All Meet in the Middle

 

The Sunset of Dimorphism: Why We All Meet in the Middle

When we are young, hormones act as expensive "paint" that colors us in distinct masculine or feminine hues. This is called Sexual Dimorphism. As we cross the threshold of 50, the body decides to stop paying the bill for this elaborate performance.

1. The Great Hormonal Evaporation

The primary reason men and women start to look alike is the convergence of hormone levels.

• For Men: Testosterone levels drop (the "andropause"), causing a loss of muscle mass, thinning of facial hair, and an increase in body fat—often redistributed to the chest and hips. Men lose the "sharp" angularity of the jaw.

• For Women: Estrogen levels plummet during menopause. Interestingly, while estrogen drops, the small amount of testosterone women naturally produce stays relatively stable. This "unopposed" testosterone can cause facial hair growth and a deepening of the voice.

• The Result: Men become softer and rounder; women become more "rugged" or angular. The body enters a state of hormonal androgyny.

2. The "Disposable Soma" Theory (Confirming Your Energy Suspicion)

Your hypothesis about energy expenditure is supported by a major pillar of gerontology called the Disposable Soma Theory, proposed by Thomas Kirkwood.

• The Logic: An organism has a limited energy budget. It must choose between Maintenance (keeping you young and pretty) and Reproduction (making babies).

• The Triage: Once the fertile years are over, the body performs a brutal form of biological triage. Maintaining secondary sexual characteristics (broad shoulders, high cheekbones, lush hair) is energetically "expensive" and provides no further evolutionary "Return on Investment" (ROI).

• The Shutdown: The body diverts resources away from high-maintenance "youth signals" to focus on basic survival—keeping the heart beating and the brain functioning. In short: The body stops trying to attract a mate it no longer needs to impress.

---

Of Termites and Totalitarianism: When Perfect Order Breeds Decay

 Of Termites and Totalitarianism: When Perfect Order Breeds Decay

Evolution often hides its cruellest jokes under the mask of efficiency. A recent Science study revealed that termites — social cockroaches that have built some of the most structured colonies on Earth — achieved their order not through genetic advancement, but through loss. To sustain absolute harmony, they deleted complexity itself.

Compared to their solitary cockroach ancestors, termites possess fewer genes, especially those governing metabolism, reproduction, and mobility. The most astonishing mutation, however, lies in the males. Because termite queens mate for life and face no rival sperm competition, there is no evolutionary reason for sperm to swim. Over generations, the genes for movement simply disappeared. Termite sperm have no tails — they are, quite literally, evolution’s lying-flat generation.

This radical simplification unmasks a deeper irony: complexity of society often demands the decay of individuality. The termite’s empire thrives because its members no longer compete. Larvae that develop quickly become tireless workers; those that grow slowly are spared for royalty and reproduction. The colony’s stability depends on suppressing personal will and turning function into fate.

The metaphor for human societies is disquieting. Highly centralized or totalitarian systems also pursue perfection through uniformity — order through obedience, harmony through self-erasure. Individuals are streamlined to serve the system’s purpose, just as termite genetics are trimmed for collective survival. When creativity and dissent atrophy, the social “genome” contracts too, producing conformity at the cost of vitality.

Ironically, the “lying flat” youth of modern societies echo the same evolutionary fatigue. Faced with rigid hierarchies, over-optimization, and meritocratic exhaustion, they choose non-competition as silent resistance. Like the tailless sperm of termites, they stop running—not from weakness, but from realizing the race no longer leads to freedom.

Perhaps this is evolution’s warning: when the cost of order is the extinction of individuality, both nature and society risk collapsing into sterile stability.