More children are born with Down syndrome in countries where abortion is not allowed and in countries where pregnancy more commonly occurs at a later age. About 1.4 per 1,000 live births in the United States and 1.1 per 1,000 live births in Norway are affected. In the 1950s, in the United States, it occurred in 2 per 1,000 live births with the decrease since then due to prenatal screening and abortions. The number of pregnancies with Down syndrome is more than two times greater with many spontaneously aborting. It is the cause of 8% of all congenital disorders.Maternal age affects the chances of having a pregnancy with Down syndrome. At age 20, the chance is 1 in 1,441; at age 30, it is 1 in 959; at age 40, it is 1 in 84; and at age 50 it is 1 in 44. Although the probability increases with maternal age, 70% of children with Down syndrome are born to women 35 years of age and younger, because younger people have more children. The fathers older age is also a risk factor in women older than 35, but not in women younger than 35, and may partly explain the increase in risk as women age. Life expectancy
The average life expectancy of a person with Down syndrome is more than 60 years and climbing. History
English physician John Langdon Down first described Down syndrome in 1862, recognizing it as a distinct type of mental disability, and again in a more widely published report in 1866.
"Examining dementia in Downs syndrome (DS): decline in social abilities in DS compared with other learning disabilities". Clinical Gerontologist, 20(3): 23–44. Taylor & Francis (Routledge). DOI 10.1300/j018v20n03_04 eISSN 1545-2301 OCLC 1106716083
Fox, Nikki (2021-11-26). "World-leading Downs syndrome bill clears first hurdle in Parliament". BBC News. Archived from the original on 2021-11-27. Retrieved 2021-11-27. External links

Down syndrome at Curlie
Downs syndrome by the UK National Health Service