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Questions tagged [lifespan]

The time between birth and death, either for an individual or as an average of a species.

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1answer
57 views

Identify brain junk - What are all the known intracellular and extracellular substances which build up with age and clog the brain?

What are the known junk substances which the body is unable to dispose of and which build up in the brain with age to eventually causes age related problems? Starting with the most obvious ones: ...
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2answers
92 views

Why isn't life expectancy normally distributed?

Lots of phenomenon in nature can be plotted onto some sort of normal distribution, and that makes intuitive sense to me (such as human height). Why then, does global human life expectancy drop off so ...
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Why can't a genetically sound human stay alive for an indefinite amount of time given all the ideal conditions? [duplicate]

I have read that even if we can control our food and lifestyle and keep things as ideal as possible, there are other factors beyond our control like effects from neutrinos passing through our body ...
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How do some deep sea creatures lower their metabolism to stay alive for a long time?

I was watching some bio related videos and saw in one that some deep sea creatures and other organisms purposefully limit their movement to decrease metabolism rates. Do they live longer? If we ...
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1answer
53 views

Are there known life expectancy differences in non human mammals by sex?

In humans either for biological or cultural reasons there are life expectancy differences by sex. But how about non human mammals? Are there known life expectancy differences in non human mammals by ...
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1answer
96 views

Is a species lifespan affected by meat consumption?

I read a review-like article about the hypothesis of Caleb E. Finch in a science magazine. The article of interest engages with the idea of Finch "[arguing] that immune functions and nutrition ...
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0answers
47 views

Which infectious disease would increase global life expectancy the most if eradicated [closed]

In the 1700s it was estimated, by Daniel Bernoulli, that wiping out smallpox would increase global life expectancy by over three years. If we could wipe out one infectious disease today, which would ...
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1answer
126 views

How does human life expectancy change with age?

Human life expectancy tends to be given as a single number reflecting age at death from birth. But life expectancy should really grow the longer you live, because, for example, once you hit your ...
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1answer
206 views

How to find the age of a memory stored in the brain?

Is there any way to find how old one's memory is? One can find the age of stones, plants, animals, etc. So why not find the age of a memory stored inside one's brain?
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2answers
223 views

Is the human lifespan still expanding?

Description 200 years ago, the human lifespan was roughly 35 to 40 years long. And it has doubled in length since then. Question Will the human lifespan continue to expand in length?
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0answers
33 views

Can we estimate longevity from menopause age?

This is from an answer in other question, about the age at which menopause occurs: Aristotle's assessment was similar to those of Hippocrates and also Roman authors, so it seems that 2000 years ...
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4answers
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Are there biological reasons why life expectancy is lower for men in most countries of the world?

I've been checking life expectancy figures for men versus women in many countries of the world and the figures for men sometimes are terrifying. Countries like Russia have a 12 years gap in disfavor ...
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2answers
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Why do germs live longer on surfaces than on skin?

After looking up how long germs live for on surface, I came across lots of resources that explain how long germs live on different surfaces. A common pattern is that germs survive longer on cold/...
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1answer
93 views

Maximum biologically possible age for a human being?

Today, most of people die because of some kind of illness that we do not yet have a cure for. However, if that was not the case, how long can human body possibly live for? Is there a theoretical ...
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Longest lived land mammal when subtracting sleeping time?

Recently, it has been found that wild elephants only sleep two hours per night. Wild elephants also live quite long, the median life span is 56 years. Now, 56 years lived with 2 hours sleep per day ...
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1answer
125 views

When do fireflies glow in their lifetime?

Does a firefly glow only when adult or larva? Or does it glow during its whole life. By glowing, I mean that they glow only when they require, not all the time. Is there a reason (evolutionary ...
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1answer
775 views

How long do tiny spiders live? [closed]

I'm pretty sure there's a spider in my ear. I feel it move and hear the scratching (i blame my cat for playing with bugs in the bed). I've gone to the doctor, but all they do is flush my ear with ...
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39 views

Infant Death Adjusted Historical Human Lifespan

I had found a good paper at one point to describe this but I can't seem to locate something similar now. I am looking for a manuscript that describes average human lifespans throughout history/...
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67 views

What is the evolutionary advantage to a lifespan limit? [duplicate]

How/Why Do Koi have a lifespan of hundreds of years? Do humans have a lifespan of decades? Do dogs have such a short lifespan? Within these questions I pose further questions. How does size relate ...
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25 views

Why does decreasing intake of protein prolongs the lifespan of a fly?

A book I read about aging suggests that it is established that a fly lives much longer when it is fed less protein. What does protein intake has to do with the lifespan of an organism? Why not ...
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38 views

Longevity Experiments

I realize this is a bit of a long shot, but sometime this year I was reading a paper about experiments that I believe were performed in Drosophila (may have been planaria) where breeding was delayed ...
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3answers
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Relationship between lifespan and reproductive age?

I remember reading a while ago that there is a "general rule" in biology between an animals lifespan and when they reach reproductive age. In other words, an organism that reaches sexual maturity ...
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0answers
177 views

Does reproduction cause aging ? Is aging just a strategy to increase reproductive success in all organisms? [closed]

Background for why I am asking this: I read a book—modern biological theory and experiments on celibacy— which uses life history theory to imply that reproduction is the reason why organisms grow old....
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1answer
164 views

How do we predict the lifespan of dinosaurs?

Of course, they are fossils now. I found a link here which states that herbivors lived far longer than carnivores. The example being a T-Rex being "old" at 29, and a herbivorous Bothriospondylus ...
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2answers
5k views

Is global life expectancy normally distributed?

I am trying to find out what the world distribution of life expectancy looks like.
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1answer
31 views

Where can I find a global life expectancy table?

I've found good information on specific countries and demographics, but I can't seem to find global numbers. I know that the world life expectancy is around 71.0, but I'm trying to get a percentile ...
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1answer
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Why do skinny people live for shorter than the norm even though calorie restriction extends life expectancy?

If I understand correctly, calorie restriction may extend life expectancy slightly (not proven exactly how much for human). But according to the statistics, skinny healthy people have even shorter ...
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2answers
130 views

Would a person live longer, if such a person lived in a planet with lower gravity? (say, Mars) [closed]

I was wondering: some companies plan to colonize Mars, many of us know. But if one were to live on Mars, would this person live longer? It seems to me that a lower gravity would mean less overall ...
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2answers
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Could we slow down life? [closed]

As far as I know there is no absolute time measurement (one that would measure time in a non-environment-dependent fashion) in any life form. Only such time measurements exist, which are dependent ...
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1answer
76 views

Would it be more genetically efficient to have shorter lifespans?

If, for example, humans had an average lifespan of, say, 30 years, and we reached sexual maturity at age 10, then we could "evolve" more quickly and theoretically "weed-out" more genetic diseases ...
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1answer
522 views

How far can we go in engineering our own evolution? [closed]

After recently seeing Christopher Nolan's Interstellar and reading Kip Thorne's The Science of Interstellar, I've seriously been reflecting on the challenges mankind faces in becoming space pioneers, ...
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278 views

Does the metabolic rate determine how fast the telomeres shorten?

In many papers one can read that telomeres may play an important role in longevity. According to Calado et al.1 the telomeres of mice are much longer than the telomeres of humans. However, mice have ...
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1answer
113 views

Human longevity interventions ranked by effectiveness [closed]

Generally living longer and with a better quality of life is considered a good thing, if not for ourselves then for our family and friends who care about us. Some factors that influence human ...
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1answer
222 views

How was the cama's life expectancy computed?

A cama is a hybrid between a male dromedary camel and a female llama. The first cama was born on January 14, 1998, yet on the Wikipedia page it is said that a cama's life span is 30–40 years. How was ...
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1answer
101 views

Do trees have no set lifespan and “quite”immortal?

Many trees survive centuries and die only in disasters like storms and lightnings or infections. So do they have no set life span? Are they exceptionally resistant to genetic mutations and have very ...
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1answer
792 views

Organs lifespan out of the body [closed]

What organ can be conserved outside of the body for the longest time and still function when reimplanted?
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1answer
948 views

How is it proved, that antediluvian people didn't live for hundreds of years? [closed]

Bible says that antediluvian people lived for 800-900 of years. Nowadays apologists say that it is possible and that we just can't know the truth. I know that one of the basic science principles is ...
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1answer
16k views

Why do ants live so long?

I was surprised to learn that worker ants in some species live many years. I would have expected a lifespan of a few weeks or months (which is apparently the case for many species). What factors ...