As of October 28, 2016, the Registry has 9,429 twin pairs (18,858 individuals). New pairs are enrolled every month. Below is a detailed breakdown of the Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Age
9 years old and under: 3.2%
10-19 years old: 1.0%
20-29 years old: 18.7%
30-39 years old: 26.2%
40-49 years old: 14.2%
50-59 years old: 13.3%
60-69 years old: 14.0%
70+ years old: 9.4%

Ethnicity
Hispanic/Latino: 3.9%

Race
One race: 97.2%
White: 90.3%
Black or African American: 2.0%
American Indian or Alaska Native: 0.6%
Asian: 2.5%
Native Hawaiian or Other Pacific Islander: 0.4%
Some other race: 1.4%
Two or more races: 2.8%
White and Black or African American: 0.5%
White and American Indian or Alaska Native: 0.8%
White and Asian: 0.8%
Two or more other races: 0.7%

Zygosity
Identical: 51.8%
Fraternal: 48.2%

Sex
Male/Male pairs: 28.2%
Female/Female pairs: 50.0%
Male/Female pairs: 21.8%

Zygosity/Sex
MZ Male pairs: 18.5%
MZ Female pairs: 33.3%
DZ Male pairs: 9.7%
DZ Female pairs: 16.7%
DZ Male/Female pairs: 21.8%

Where are our members located?