Retrieving and applying clinical references

I am a [clinical role/specialty, e.g., neurologist, geriatrician, PCP] following a [age]-year-old [gender] patient who had [index neurologic event/condition, e.g., ischemic stroke/TIA/ICH] [timeframe, e.g., 2 years] ago with [degree of residual deficits]. At [his/her/their] most recent visit, [he/she/they] reported [cognitive concern], including [example], and has become [behavior or mood change]. [His/her/their] functional status in daily activities is [mostly preserved / mildly impaired / declining]. Should these symptoms raise suspicion for [condition], or are they more consistent with [normal age-related cognitive changes]? Provide a differential diagnosis and explain why it's likely or not.