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Stats: 17,479 members, 69,438 Topics, 15,457 Comments. Date: Jun 19 2019, 7:52 pm

Junior Taamas
, Nigeria.
One of mankind’s greatest wishes is to live
without the worry of old age. Fountains of
youth and mythological sources of longevity
are common in our legends and fairy tales,
but each of us progresses slowly, aging
toward our eventual end. Still, we wish for
something different.

As a sort of bitter joke, we can look to some
of the other creatures on Earth and find that
they have what we wish for. Some refer to
these animals, perhaps mistakenly, as
biologically immortal. But they can die.

The
difference is in how they arrive there—
without ever growing old as we do. Rather,
they keep their youthful vigor right up until
some other means takes them.

Here are 10 animals that do not die of old
age or can halt the process.

10. Marine Sponges
See 1st picture below

As far as multicellular animals go, marine
sponges are as simple as they come. They
don’t possess the common elements that
other animals (like us) have in abundance.

They have no internal organs, digestive
tracts, or nervous and muscular systems.

Yet a marine sponge specimen has been
found to be at least 11,000 years old, with
some studies suggesting the potential life
span of these creatures to be in the
hundreds of thousands of years. The key to
their longevity may lie in their simplicity.

Andrey Lavrov and Igor Kosevich, biologists
who studied marine sponges’ abilities, found
that when the sponges were subjected to
tissue dissociation (by mechanically or
chemically separating the cells from one
another), the sponges were able to re-form
into their original shape.

The biologists reported, “In a number of
cases, such multicellular aggregates may
result in a full reconstruction of an animal’s
initial organization.” These amazing
regenerative abilities render these creatures
nearly ageless.

9. Planaria (Flatworm)
See 2nd picture below

Our school classes taught us about the
special regenerative powers of the
flatworms, unassuming creatures that harbor
the ability to regrow into two healthy
flatworms if cut in half. Recently, a lab at
MIT performed an experiment that regrew an
entire flatworm from a single cell. But one
cause of this remarkable feat may not have
been mentioned in our high school classes.
Dr. Aziz Aboobaker of The University of
Nottingham commented:

Usually when stem cells divide—to heal
wounds or during reproduction or for
growth—they start to show signs of aging.

This means that the stem cells are no longer
able to divide and so become less able to
replace exhausted specialized cells in the
tissues of our bodies. [ . . . ] Planarian
worms and their stem cells are somehow
able to avoid the aging process and to keep
their cells dividing.
Due to this cellular youth, flatworms defy
aging, making it difficult to accurately
measure a flatworm’s life span.

8. Bdelloid Rotifers
See 3rd picture below

These small—1 millimeter (0.04 in) or less—
creatures can be found the world over in any
body of water but also in such homes as
mosses and lichen. In general, they live for
about 30 days. Hardly ageless, so why their
place on our list?

These microscopic animals have a powerful
ability to stop their bodily functions in times
of crisis, such as starvation or dehydration,
and suspend their own aging process. In fact,
this prolonged time of inactivity can be
longer then their normal life span.

Some bdelloid rotifers could last 40 days
while starving and then pick up again with
their normal life spans as if the 40-day
period had never happened. This would be
like finding humans who could go without
eating for 100 years without aging a day the
entire time. Once food was available again,
they would pick up aging where they left off
and live a normal life from then on.

Continue Reading Below
10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing

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Rufai Oladimeji
Lagos State University
English
100Level, Nigeria.
7. Hydra
See 1st picture below

This creature is only about 2.5 centimeters
(1 in) high and treelike. To understand its
place on our list, we need to understand the
concept of senescence, which is the increase
in mortality rate as a creature gets older.

For example, humans are more likely to die
the older we get. However, the Hydra does
not have this increase in mortality. (Except
for one species, Hydra oligactis . Sorry,
buddy.)

They accomplish this feat using three distinct
types of stem cells, which are initially
undifferentiated and can eventually become
many different specialized cell types. These
stem cells are actively renewing the body of
the Hydra and thus fighting off any aging
process that could lower their mortality rate.
In a laboratory setting, it’s estimated that 5
percent of Hydra could live up to 1,400
years using this process

6. Ocean Quahog Clam
See 2nd picture below

This marine bivalve mollusk is special
because it is exceptionally easy to determine
the creature’s age. Like a tree, its life span is
recorded in the growth rings of its shell.
Even more, those rings offer insight into its
life—with wide rings showing a year of
plentiful food and narrow rings showing a
scarcer time.

Due to this trait, one ocean quahog was
dated to 507 years old—the oldest of its kind
ever found. This would put its original
birthday sometime in 1499.

The secret to this longevity is linked to the
quahog’s unusually thin production of
reactive oxygen species, which are unstable
and oxygen-holding molecules (aka free
radicals). Buildup of these molecules can
cause damage to DNA, RNA, and proteins and
result in cell death.

Due to the quahog’s attenuated amount of
these reactive oxygen species, it is able to
fight off a common source of aging and live
for many centuries. The 507-year-old
quahog, named Ming, only met its end
because it was frozen after its capture to
allow researchers to properly determine its
age. In all likelihood, it could have lived for
much longer.

5. Lobster
See 3rd picture below

Often caught to be eaten as delicacies, these
bottom-feeding ocean animals have
indeterminate growth, which means they
have no maximum size. As a result, the
longer a lobster lives, the bigger it will get—
with no biological process to halt that
growth.

The heaviest lobster ever caught was a little
over 20 kilograms (44 lb). It was found off
the coast of Nova Scotia. Estimates of these
animals’ life span range from 50 to 100
years—not much different from that of
humans. But the fascinating thing about
lobsters is how they age and die. They show
no loss of appetite, sex drive, energy, or
metabolism as they get older.

However, lobsters do make it hard to
measure their age. They grow in a process of
molting, where they shed their entire
exoskeleton. After each molting, all hard
surfaces of the animal are discarded. So
there is nothing left that can be aged with
accuracy.

It is that process of molting that eventually
kills them and not the usual aging process
that humans face. The larger a lobster
becomes, the more dangerous molting is and
the more energy it takes.

Eventually, a large lobster will no longer be
able to survive the process or even muster
up enough energy to begin it, thanks to its
giant size. If this hurdle were somehow
removed, there’s no telling how long these
creatures could live.

4. Midland Painted Turtle
See 4th picture below

Although many turtles show a long life span
and lack of senescence, Blanding’s turtles
and midland painted turtles have a seemingly
backward take on aging. The elderly females
lay even more eggs than their younger
counterparts and die at a lower rate. They
become more likely to keep living with age.

The longevity of the entire turtle family is
impressive. One giant tortoise lived to at
least 250 in the Calcutta zoo. Dr. Christopher
J. Raxworthy from the American Museum of
Natural History said plainly, “Turtles don’t
really die of old age.” Instead, the internal
organs of elderly turtles are almost identical
to those of their teenage counterparts.

This impressive life span is also shown in
how slowly female turtles reach sexual
maturity—only after 40 or 50 years in some
species. Dr. Raxworthy added that if it
weren’t for getting crushed by an automobile
or falling prey to a disease, a turtle could
live indefinitely.

Continue Reading Below
10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing
Work Hard... Work hard to fix not only your life in this world but also the more important life to come. No time!!!

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Rufai Oladimeji
Lagos State University
English
100Level, Nigeria.
3. Turritopsis Dohrnii (Jellyfish)
See 1st picture below

Imagine that we could decide on a whim to
reverse our aging at any point in our lives.
Our hair would get less gray, our wrinkles
would disappear, our bodies would get
stronger, and our metabolism would
increase. We’d be like teenagers again and
then like children and, finally, like babies.

Then we’d start aging again from the
beginning, living our lives a second time
none the worse for wear. This is the exact
situation of the Turritopsis dohrnii, the
immortal jellyfish. At any point in its life, the
jellyfish can reverse aging in a process
known as transdifferentiation, revert to its
earliest form, and then continue living from
there. So far as we know, this process can
continue without end.

This mechanism can be triggered by anything
from mutilation to old age, starvation, or
disease. If left to their own devices, these
jellyfish will rejuvenate about 10 times over
the course of two years.

Sometimes, these events happen less than a
month apart. Also a proficient hitchhiker,
this everlasting jellyfish has spread to every
ocean in the world by hitching rides on
cargo boats.

2. Bristlecone Pine Trees
See 2nd picture below

These gnarly and knotted trees look anything
but ageless. Their lifetime seems evident in
their shape, with branches twisting in and
around on themselves like the bony fingers
of an old man.

Inside, though, is a life-form of incredible
sturdiness. The bristlecone pine measures its
life not in centuries but in millennia. The
oldest one discovered is estimated to be over
5,000 years old.

The exact location of this tree and other
exceptionally old bristlecone pines is kept a
secret to keep them safe from intentional or
accidental damage. Dated to be just under
5,000 years old, another bristlecone pine
named Prometheus was cut down in the
same area.

This pine’s wood is dense and resinous,
giving it natural defenses against threats like
fungi and insects. Even if the tree does die,
its dead form holds on strong for centuries
and is kept upright by its roots.

1. Pando Tree Colony
See 3rd picture below

Its name means “I spread” in Latin, and it’s
also known as “the trembling giant .” This
massive organism defies all expectations. It
is a grove of quaking aspens, named for the
sound the leaves make at even the slightest
flutter of wind.

Pando is a colony of trees spread across 100
acres of land, and every tree there is the
same organism. This is because quaking
aspen trees reproduce mainly by sprouting
new trees from an already existing root
system. A single organism can have many
tree trunks sprouting out of the ground.

Pando has 47,000 trunks. The individual
trunks only persist for 100 to 150 years or
so, but Pando as a whole has been estimated
to be at least 80,000 years old with
optimistic estimates at one million years old.

This everlasting grove is among the oldest
and largest living creatures on our planet
and weighs some 6 million kilograms (13
million lb).

listverse.com/2019/05/28/10-ageless-animals-that-do-not-grow-old/
10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing10 Ageless Animals/Organisms That Do Not Grow Old - Books/Literature/Writing
Work Hard... Work hard to fix not only your life in this world but also the more important life to come. No time!!!

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