Best online dating site for late 20s

But levels of friendly bacteria in the gut drop significantly after 55, particularly in the large intestine, says Tom Mac Donald, professor of immunology at Barts And The London medical school.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.

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The bladder starts to contract suddenly, even when it's not full.Women are more vulnerable to bladder problems as, after the menopause, declining oestrogen levels make tissues in the urethra - the tube through which urine passes - thinner and weaker, reducing bladder support.It's then harder to work the lungs and also means some air remains in the lungs after breathing out - causing breathlessness.Aged 30, the average man can inhale two pints of air in one breath. Starts ageing at 65Our voices become quieter and hoarser with age.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.Start ageing at 40Glasses are the norm for many over-40s as failing eyesight kicks in - usually long-sightedness, affecting our ability to see objects up close.As we age, the eye's ability to focus deteriorates because the eyes' muscles become weaker, says Andrew Lotery, professor of ophthalmology at the University of Southampton.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.More likely, says Gareth Evans, breast cancer specialist at St Mary's Hospital, Manchester, our cells become damaged with age - as a result, the genes which control cell growth can mutate, causing cancer.