Older fathers are Simon Cowell, whose son Eric was born in 2014 when he was 54
It is not only women who are confronted with the ticking of their biological clock.
Men who try to have a child in their fifties are one third less likely to become pregnant than younger men, a study suggests.
Experts now believe that women are approaching the menopause, men are seeing a similar decrease in their sperm quality at the average age of 51.
Researchers followed more than 4,200 men who tried to have a baby through IVF.
They found that men aged 51 and over were 34 percent less likely to become pregnant than those younger than 35.
Although there are many outdated celebrity fathers, from Rod Stewart to Mick Jagger, the evidence suggests that sperm DNA is damaged with age.
This may explain the higher risk of older men with children with autism and schizophrenia, and suggests that women should choose a man under 50 if they want a child.
Dr. Guy Morris, the researcher who led the study at University College London, said: & # 39; Men's sperm does not appear to be affected by their age up to the age of 50, and that is when there is a significant decline is.
& # 39; In women, they lose the function of their reproductive organs as they go through the menopause.
& # 39; In men, the quality and quantity of seed production decreases with age, and this appears to have a significant effect after the age of 50. & # 39;
Older fathers in show business are Simon Cowell, whose son Eric was born in 2014 when he was 54, Frank Skinner, whose son Buzz Cody was born in 2012 when he was 55, and Rod Stewart, who was 66 when his eighth child, Aiden, was born. in 2011.
These cases are feared for the & # 39; myth & # 39; which men can procrastinate with having a child to promote middle age.
Researchers analyzed the records of 4,271 men with IVF at the Center for Reproductive and Genetic Health (CRGH) in London between 2009 and last year.
They found that the pregnancy rate dropped as men got older, with nearly half of the younger to 35 years of age being successful, but only 35.2 percent of men aged 41 to 45.
Sir Mick Jagger, famous for his time in The Rolling Stones, gave birth to his eighth child at the age of 73 in December 2016
Men who try to have a child in their fifties are one third less likely to become pregnant than younger men, a study suggests in men with a baby with IVF. Stock photo
The pregnancy rate in partners of men aged 46 to 50 fell to 32.8 percent and only reached 30.5 percent for men aged 51.
Taking the age of women into account, the decrease in pregnancy was most significant for men aged 51 years.
Men of this age and older were 34 percent less likely to be successful in IVF than under the age of 35, showing the fertility of men who are declining significantly this age.
Dr. Morris, who also works at CRGH, said: & # 39; There may be a public perception that male fertility is independent of age.
& # 39; Stories about celebrity men who raised children up to the 1960s can give a distorted picture of the potential risks of postponing paternity. & # 39;
Dr. Morris, who presented the findings at the annual meeting of the European Association for Human Reproduction and Embryology in Vienna, added: & # 39; In the context of this emerging evidence for the damaging effect of increasing old age, our data certainly supports the importance of educating men about their fertility and the risks of postponing paternity. & # 39;
An earlier study, from Beth Israel Deaconess Medical Center in Boston, found men aged 40 to 42 a fifth less likely to have a baby than before their 30th birthday.
While women are born with a limited supply of eggs, men make sperm all their lives.
The repeated cell divisions that are required for this can introduce an increasing number of errors into the DNA of the sperm, making it less able to fertilize an egg.
The study found that only 42 percent of men over 51 have normal quality sperm, compared to 61 percent of those under that age.
There is currently no age limit for IVF in men, although health warning recommends NICE 42 as the threshold for women receiving fertility treatment at the NHS.
Dr. Jane Stewart, president of the British Fertility Society, said: “When people see outdated celebrities like Rod Stewart becoming fathers, it's easy to assume that older men are just as fertile as their young counterparts.
& # 39; We know this is not entirely true – male fertility decreases with age.
& # 39; This study is interesting because it looks at the impact of a person's age on IVF success, not just the chance of getting pregnant without IVF. & # 39;
Professor Adam Balen, co-chair of the British Fertility Society Fertility Education Initiative, said: & We want fertility to be taught as part of the RSE curriculum (relationships and sex education) and have succeeded in getting it included.
& # 39; Young men need this information – they need to know that they do not necessarily remain fertile throughout their lives and that they have more problems as they get older. & # 39;
ARE WOMEN LESS LIKELY TO COME WHEN THEY ARE OLDER?
The fertility of women decreases as they get older – but the influence of men's age on fertility is not so clear.
How the fertility of men and women is expected to change with age
The success of pregnancy at a certain age is not unequal, but there are estimates based on research.
The NHS states that fertility decreases most in the mid-1930s & # 39; 30.
According to a study quoted by the NHS, among couples with regular unprotected sex:
- from 19 to 26 – 92 percent will become pregnant after one year and 98 percent after two years
- 35 to 39 years – 82 percent will become pregnant after one year and 90 percent after two years
Other data show that between 25 and 27 years old who try to get pregnant in 12 cycles have a success rate of around 80 percent.
The figure, on the other hand, is closer to the figure of 50 percent for people between 40 and 45 years old.
This is according to two studies, one led by Boston University School of Public Health in 2017, published in the American Journal of Obstetrics and Gynecology, and another led by Princeton University in 1986, published in Science.
At the age of 51, women have about 1,000 immature eggs at menopause – compared to two million at birth – but these are not fertile, according to the British Fertility Society.
The success of IVF also depends on age, as well as on the cause of infertility. According to the NHS, the percentage of IVF treatments that result in a live birth is 29 percent for women younger than 35 years. But for people older than 44 it is only two percent. This is why IVF is not recommended above the age of 42.
Because women's fertility is declining, many women who want children want to know at what age they are trying to get pregnant to have a good chance of having the family they want.
The British Fertility Society shows when a woman should try to become pregnant to get the number of children she wanted:
|Chance of achieving the goal of family size||1 child||2 children||3 children|
|Without IVF||50%||41 years old||38 years old||35 years|
|75%||37 years old||34 years old||31 years old|
|90%||32 years||27 years||23 years old|
|With IVF||50%||42 years||39 years old||36 years|
|75%||39 years old||35 years||33 years old|
|90%||35 years||31 years old||28 years|
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