Which of the following is included in the definition of vulnerable populations?

The definition of vulnerable populations specifically includes individuals who are at a higher risk for health disparities and facing various barriers to accessing healthcare and services. Persons with mental disabilities fall into this category due to their unique challenges, including social stigma, discrimination, and potential difficulties in communication and self-advocacy. These factors can significantly limit their access to necessary medical and psychological support, making them more susceptible to negative health outcomes.

In contrast, the other options do not represent vulnerable populations as typically defined. Wealthy individuals generally have more access to resources, thus are not considered vulnerable. Healthy adults are typically in a strong position with fewer health risks and hence are not classified as vulnerable. Senior citizens over 65 may experience certain vulnerabilities related to age, but this group can range widely in health status and resource availability, so they do not universally qualify as a vulnerable population without additional context regarding their circumstances.