The Helmand River is the longest river in Afghanistan. It rises in the Hindu Kush in the east of the country, flows roughly south-west for about 800 miles, and empties into marshland[?] near the border with Iran.
... the population is spread out with 29.0% under the age of 18, 5.0% from 18 to 24, 29.0% from 25 to 44, 24.2% from 45 to 64, and 12.7% who are 65 years of age or older. ...