Here is a consolidated list of considerations when working with senior investors. You may want to create a checklist to use routinely when meeting with the client. This will document changes over time:
Client appears unable to process simple concepts.
Client appears to have memory loss.
Client appears to have difficulty speaking or communicating.
Client appears unable to appreciate the consequences of decisions.
Client appears to have erratic behavior.
Client appears to be disoriented with surroundings or social setting.
Client appears uncharacteristically unkempt or forgetful.
Client appears to be concerned or confused about missing funds in his/her account while reviews indicate there were no unauthorized money movements.
Client appears to lack awareness or understanding of recent financial transactions.
Client appears to make decisions that are inconsistent with his/her long term goals or commitments.
Client appears to reject appropriate investment advice that is consistent with investment objectives.