Inclusion Criteria:  age 18-85 years community dwelling residency: participants must plan to reside in the local area for the study duration. fluent English-speaker Audiometric hearing impairment: participants must have hearing configuration that could benefit from OID hearing intervention. Mini-Mental State Exam (MMSE) score > 23 for individuals with high-school degree or less; Mini-Mental State Exam (MMSE) score >25 for individuals with some college or more; participants must be at risk for cognitive decline the range quantified well by neurocognitive testing, and so must be free from more substantial cognitive impairment at baseline. willingness to participant and adhere to the protocol: participants must be willing and able to consent to participate in the study and be willing to commit to adhere to the study protocol for the duration of the study (3 years)  Exclusion Criteria:  self-reported disability in >2 or more Activities of Daily Living (ADL) medical contraindication to use of OID; because OIDs will be the primary device used in the hearing intervention, participants with medical contraindications to OID use are excluded