Different Parts of Our Body Age At Different Times

WE all accept that getting older is inevitable, and now leading clinicians have revealed the exact age when different body parts start to decline, most alarming being the brain and the lungs.

French doctors have found that the quality of man's sperm starts to
deteriorate by 35, so that by the time a man is 45, a third of pregnancies end in miscarriage.
Here, with the help of leading clinicians, Angela Epstein tells the Daily Mail,
the ages when different parts of the body start to lose their battle with time.

BRAIN -Starts aging at 20.
As we get older, the numberof nerve cells - or neurons - in the brain decrease.
We start with around 100 billion, but in our 20s, this number starts to decline. By 40, we could be losing up to 10,000 per day,affecting memory, co-ordination  and brain function.
(Better start meditating before its too late)

GUT-Starts aging at 55.
A healthy gut has a good balance between harmful and 'friendly' bacteria. But levels of friendly bacteria in the gut drop significantly after 55, particularly in the large intestine, says Tom MacDonald, professor of immunology at Barts Medical School in London .
As a result, we suffer from poor digestion and an increased risk of gut disease. Constipation is more likely as we age, as the flow of digestive juices from the stomach, liver, pancreas and small intestine slows down..

BREASTS- Start aging at 35.
BY their mid-30s, woman's breasts start losing tissue and fat, reducing in size and its fullness. Sagging starts at 40 and the aerola (the area surrounding the nipple) can shrinks considerably.

BLADDER- Starts aging at 65.
Loss of bladder control is more likely when you hit 65.
Women are more vulnerable to bladder problems as, after the menopause,
declining estrogen levels make tissues in the urethra - the tube through which urine passes - thinner and weaker, reducing bladder support.
Bladder capacity in an older adult generally is about half that of a younger person - about two cups in a 30-year-old and one cup in a 70-year-old....

LUNGS- Start aging at 20.
Lung capacity slowly starts to decrease from the age of 20.

By the age of 40, some people are already experiencing breathlessness.

This is partly because the muscles and the rib cage which control
breathing stiffen up.

VOICE- Starts aging at 65.
Our voices become quieter and hoarser with age.
The soft tissues in the voice box (larynx) weaken, affecting the pitch, loudness and quality of the voice. 
A woman's voice may become huskier and lower in pitch, whereas a man's might become thinner and higher.

EYES- Start aging at 40.
Glasses are the norm for many over-40s as failing eyesight kicks in - usually long-sightedness, affecting our ability to see objects up close.

HEART- Starts aging at 40.
The heart pumps blood less effectively around the body as we get older. This is because blood vessels become less elastic, while arteries can harden or become blocked because of fatty deposits forming on the coronary arteries - caused by eating too much saturated fat.
The blood supply to the heart is then reduced, resulting in painful angina.
Men over 45 and women over 55 are at greater risk of a heart attack.

LIVER- Starts aging at 70.
This is the only organ in the body which seems to defy the aging process.

KIDNEYS - Starts aging at 50.
With kidneys, the number of filtering units (nephrons) that remove waste
from the bloodstream starts to reduce in middle age.

PROSTATE- Starts aging at 50.
The prostate often becomes enlarged with age,leading to problems such as increased need to urinate, says Professor Roger Kirby, director of the Prostate Center in London .
This is known as benign prosthetichyperplasia and affects half of men over 50,
but rarely those under 40.
It occurs when the prostate absorbs large amounts of the male sex hormone testosterone, which increases the growth of cells in the prostate. 
A normal prostate is the size of a walnut, but the condition can increase this to the size of a tangerine.

BONES-Start aging at 35.
'Throughout our life, old bone is broken down by cells called osteoclasts
and replaced by bone-building cells called osteoblasts - a process called bone turnover, explains Robert Moots, a professor of rheumatology at  Aintree University Hospital in Liverpool .
Children bone growth is rapid - the skeleton takes just two years to renew itself completely.
In adults, this can take ten years. Until our mid-20s, bone density is still increasing. But at 35 bone loss begins as part of the natural aging process.

TEETH- Start aging at 40.
As we age, we produce less saliva, which washes away bacteria, so teeth
and gum are more vulnerable to decay. Receding gum - when tissue is
lost from gums around the teeth - is common in adults over 40.

MUSCLES- Start aging at 30.
Muscle is constantly being built up and broken down, a process which is well balanced in young adults.
However, by the time we're 30, breakdown is greater than build up, explains Professor Robert Moots.
Once adults reach 40, they start to lose between 0.5 and 2 per cent of their muscle each year.

Regular exercise can help prevent this.

HEARING- Starts aging by mid-50s.
More than half of the people over 60 lose hearing because of their age, according to the Royal National Institute for the Deaf.

SKIN- Starts aging by mid-20s.
The skin starts to age naturally in your mid-20s.

TASTE AND SMELL- Start aging at 60.
We start out in life with about 10,000 taste buds scattered on the tongue.
This number can halve later in life.

After we turn 60, taste and smell gradually decline, partly as a result of
the normal aging process.

FERTILITY- Starts aging at 35.
Female fertility begins to decline after 35, as the number and quality of eggs
in the ovaries start to fall.

The lining of the womb may become thinner, making it less likely for a fertilized egg to take, and also creating an environment hostile to sperm.

HAIR- Starts aging at 30.
Male hair loss usually begins in the 30s.

Hair is made in tiny pouches just under the skin's surface, known as follicles.
A hair normally grows from each follicle for about three years, is then shed,
and a new hair grows.

Most people will have some Grey hair by the age of 35. When we are young,
our hair is colored by the pigments produced by cells in the hair follicle known asmelanocytes