The median age in Darien is 41 years old. The largest percentage of Darienites, 31% (a total of 6,228), fall within the ages of 25-49. OtherĀ  ranges: newborn to 4, 1,673, 8%; ages 5-17, 4,097, 21%; ages 18-24, 1,035, 6%; ages 50-64, 4,104, 21%; ages 65 and older, 2,640, 13%.