[Knowledge] A big one and a small one, a high one and a low one, is there really so much to a man's testicles?

Preface

Many people's first reaction to the word ‘eunuch’ is mutilation, sadness, and even accompanied by historical prejudice.

But do you know what? In the past few centuries, the average life expectancy of eunuchs has been longer than that of ordinary men.This is not some wild legend, but a phenomenon supported by data and research.

So here's the question: can men really live longer if they lose their testicles? What exactly is the reason behind this? And what does it mean for the average male?

Do men really live longer when they lose their testicles?

This question may seem outrageous, but it is indeed supported by scientific evidence.

In 1969, a comparative study investigated the lifespans of 935 average men and 297 castrated men, and found that the average life expectancy of the average man was 64.7 years, while castrated men lived to be about 70.7 years old.

Not only that, the journal Current Biology also published a study on the lifespan of 81 Joseon eunuchs and found that their average life expectancy was over 70 years, which was actually 14.4 to 19.1 years longer than the average male at the time.

This gap cannot be ignored.

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Can evidence of the relationship between testicles and longevity also be found in animals?

There are other factors that can interfere with human studies, but animal experiments are more convincing.

A team of researchers from the University of Otago in New Zealand and the University of California, Los Angeles, compared DNA differences between castrated and uncastrated rams.

They found that the castrated rams aged significantly slower on the ‘epigenetic clock’.

This is because castration deprives the rams of androgens, leading to hypomethylation of some regions of the gene, which in turn displays characteristics closer to those of females, thus slowing down the aging process.

The study was also published in the prestigious journal eLife, and serves as strong evidence to discuss differences in human longevity.

Is something wrong if your testicles are not the same size?

Many men will find that their two testicles are one large and one small, one high and one low, so they start to worry if there is something wrong with their body.

In fact, this situation is very common. A Canadian study collected samples from 4,333 men, and the results showed that about 80 per cent of men had differences in the size and height of their testicles, with the difference usually being about 1 cm.

This asymmetry is usually due to a difference in the rate of development of the testicles on each side, and is not a disease, nor does it affect fertility. If there is no pain or abnormal hardness, it is basically normal.

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Does age affect testicle size?

Yes, and not in a small way.

Before the age of 10, the male testicles are about 1 to 3 millilitres in size; they develop rapidly after puberty and are usually between 15 and 25 millilitres in adulthood.

However, after the age of 60, as the body's functions decline, the size of the testicles shrinks, in some cases to less than 16 millilitres.

This suggests that the state of the testicles actually changes naturally with age, and as long as there is no obvious pain or hardness, there is basically nothing to worry about.

Is the bigger the testicles, the better the sex?

This is a widely circulated statement, but it is not actually accurate.

The size of the testicles is indeed related to the production of androgens (e.g. testosterone), but as long as they are functioning properly, the difference in the amount of hormone produced will not be too great, whether it is 15 ml or 25 ml.

And oversized testicles do not mean stronger, but instead may be a sign of certain diseases, such as testicular tumour, testicular syringomyelia or epididymitis.

Therefore, there is no need to be overly concerned about the size as long as the testicles are within the normal size range, as long as they are asymptomatic and not painful.

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The ‘line’ in the middle of the testicles, is it normal?

If you look carefully at your scrotum, you should be able to see a distinct line in the middle. This is a normal physiological phenomenon called ‘scrotal suture’.

During early embryonic development, the male and female reproductive systems are a unified set of structures, which later diverge under the influence of sex hormones.

The scrotal suture is a mark left by the closure of the organs and has no pathological significance.

This line also has a practical role, for example, doctors will use this line as a reference when doing testicular or scrotal surgery, as a positioning point for the surgical incision, so there is no need to be nervous when you see it.

When do I need to pay special attention to testicular problems?

While most of the above are normal physiological conditions, there are some changes that need to be watched out for:

• Abnormal number of testicles: are there only one or more testicles? Are there ‘hidden testes’?
• Abnormal testicular position: are they growing outside the scrotum?
• Sudden change in size of the testicles: are they noticeably enlarged or shrunken?
• Are there any hard lumps or tenderness when touched?

Once these abnormalities are detected, it is best to consult a doctor in a timely manner to check for cryptorchidism, tumours or other pathologies.

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Conclusion

At the end of the day, no one is going to voluntarily remove their testicles because they ‘might live longer’.

The point of these studies is not to encourage us to make extreme decisions, but to help us understand our bodies and the deeper impact of sex hormones on our health.

It's not whether or not our testicles are ‘high or low’, it's whether or not we're ignoring our body's signals.

Maintaining a regular routine, managing stress, and paying attention to hormonal health are all seemingly commonplace habits that really make a difference in longevity.

-End-