The U.S. Centers for Disease Control and Prevention defines aging in place as "the ability to live in one's own home and community safely, independently, and comfortably, regardless of age, income, or ability level". Environmental gerontology Research in environmental gerontology indicates the importance of the physical and social environment of housing and the neighborhood (public space), as well as its implications for aging in place. Preference Most adults would prefer to age in place—that is, remain in their home of choice as long as possible. In fact, 90 percent of adults over the age of 65 report that they would prefer to stay in their current residence as they age. One-third of American households are home to one or more residents 60 years of age or older. Technology can be an enabler for aging in place—there are four categories of technology that acts as an enabler—Communication and Engagement, Health and Wellness, Learning and Contribution, and Safety and Security. Caregiving technologies help those who care for older adults provide that care in the most effective way—and include new technologies for smart phones and tablets, as well as websites—such as Caring.com or AARP.org/Caregiving. Home modifications There exist many risks for injury to older adults in the common household, therefore impacting upon their capability to successfully age in place. Among the greatest threats to an ability to age in place is falling. According to the CDC, falls are the leading cause of injurious death among older adults. Therefore, engagement in fall prevention is crucial to one's ability to age in place. Common features in an everyday household, such as a lack of support in the shower or bathroom, inadequate railings on the stairs, loose throw rugs, and obstructed pathways are all possible dangers to an older person. However, simple and low-cost modifications to an older person's home can greatly decrease the risk of falling, as well as decreasing the risk of other forms of injury. Consequently, this increases the likelihood that one can age in place. Some examples of home modifications include: increased lighting, accessible switches at both ends of the stairs, additional railings, grab bars, nonskid flooring, a hand-held flexible shower head, walk-in bathtubs, and the removal of throw rugs and clutter. In most cases, home modifications can be simple and cost-effective, while simultaneously offering substantial benefits to the individual. Other modifications to the home – especially those that require retrofitting –