youth twins

Demographics

Adults

As of November 1, 2022, the Registry has 9,260 adult twin pairs (18,520 individuals). Below is a detailed breakdown of the Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Adult Age Group% at Enrollment% Today
18–1920.70.0
20–2920.46.7
30–3915.229.6
40–4912.619.1
50–5913.114.5
60–6911.914.6
70+6.015.6
updated 11/4/2022

Ethnicity

Hispanic/Latino: 3.7%

Race

White: 90.5%
Asian: 2.5%
Black: 2.0%
American Indian/Alaska Native: 0.6%
Pacific Islander: 0.4%
Other: 1.4%
More than one race: 2.6%

Zygosity

Identical: 53.2%
Fraternal: 46.8%

Sex

Male/Male pairs: 27.8%
Female/Female pairs: 50.5%
Male/Female pairs: 21.7%

Zygosity/Sex

MZ Male: 18.8%
MZ Female: 34.4%
DZ Male: 9.0%
DZ Female: 16.1%
DZ Male/Female:  21.7%

Youth

As of November 1, 2022, the Registry has 611 juvenile twin pairs (1,222 individuals). Below is a detailed breakdown of the Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Youth Age Group% at Enrollment% Today
4 and younger67.313.3
5 to 925.947.6
10 to 146.930.3
15 to 170.08.8
updated 11/4/2022

Ethnicity

Hispanic/Latino: 7.9%

Race

White: 81.8%
Asian: 1.3%
Black: 1.1%
American Indian/Alaska Native: 0.5%
Pacific Islander: 0.5%
Other: 1.8%
More than one race: 12.9%

Zygosity

Identical: 54.2%
Fraternal: 45.8%

Sex

Male/Male pairs: 40.9%
Female/Female pairs: 40.4%
Male/Female pairs: 18.7%

Zygosity/Sex

MZ Male: 25.2%
MZ Female: 29.0%
DZ Male: 15.7%
DZ Female: 11.5%
DZ Male/Female: 18.7%