In 2005, 42.1% of the population was married or with a partner. In 2005, 68.0% of individuals aged 45-54 were married or with a partner.  In 2005, 69.9% of individuals aged 55-64 were married or with a partner. In 2005, 65.4% of individuals aged 65-74 were married or with a partner. In 2005, 51.5% of individuals aged 75-84 were married or with a partner.  In 2005, 31.2% of individuals aged 85-94 were married or with a partner.

*Note: "An unmarried partner in an unmarried partner household is an adult who is unrelated to the householder, but shares living quarters and has a close personal relationship with the householder. This relationship is based on the self identification of respondents." -U.S. Census Bureau

Havens, J. (2006). [Analysis of the U.S. Census Current Population Survey for March 2005]. Unpublished raw data. Center on Wealth and Philanthropy for the Center on Aging & Work / Workplace Flexibility. Boston College, Chestnut Hill, MA

"The Current Population Survey (CPS) is a monthly survey of about 50,000 households conducted by the Bureau of the Census for the Bureau of Labor Statistics. The survey has been conducted for more than 50 years. The CPS is the primary source of information on the labor force characteristics of the U.S. population. The sample is scientifically selected to represent the civilian noninstitutional population. Respondents are interviewed to obtain information about the employment status of each member of the household 15 years of age and older. However, published data focus on those ages 16 and over. The sample provides estimates for the nation as a whole and serves as part of model-based estimates for individual states and other geographic areas. Estimates obtained from the CPS include employment, unemployment, earnings, hours of work, and other indicators...They are available by a variety of demographic characteristics including age, sex, race, marital status, and educational attainment...occupation, industry, and class of worker."