NOTE - this was a redirect, but it's not appropriate to redirect from quadruplet etc to twin. We need an article on multiple birth here
... 25 to 44, 28.7% from 45 to 64, and 13.9% who are 65 years of age or older. The median age is 41 years. For every 100 females there are 98.0 males. For every 100 females ...