The old father easily gave birth to a bad boy

Scientists believe that older men often give birth to worse babies due to genetic changes.

Scientists from the University of Vienna (Austria) conducted a survey of a group of 6 men and 6 women. They were shown 4,018 photos of 18-20 year old men and 4,416 photographs of women of this age, after which they were asked to assess the attractiveness of people in the photos.

Those who were born when they were 22 years old were 5-10% more attractive than their 40-year-old father

The results show that images of older dads are less attractive. However, the lifespan of these people is higher than those with young dads. Specifically, those who were born when their 22-year-old father was rated 5-10% more attractive than those born when their father was 40 years old.

The difference is explained by scientists because of genetic changes . In older men, sperm cells do not replicate DNA as effectively as they did in the younger age, leading to genetic changes.

Dr. Martin Fielder, an anthropologist at the University of Vienna, said: 'Over the past 16 years, the rate of genetic change has doubled. Other studies found 25 changes / sperm in men aged 20 and at 40, this number was 65. When the 56-year-old man, this number continues to double. '

Scientists also warn children of older fathers and mothers at higher risk of autism and mental disorders. In the UK, about one in 100 adults are thought to be affected by autism, caused by genetic and environmental factors.