PROBLEM. Age-related decline in higher cognitive functions and financial decision making can lead to bad financial decisions, which can snowball into financial crisis or ruin for an elderly person. Traditionally, evaluating the higher cognitive functions and financial decision making capabilities of any person was a task for a trained psychologist/psychometrist and thus it was labor-intensive and expensive.

IDEA. A test of cognition AND financial decision making capability that can be administered through a browser, app or phone (e.g. an interactive voice response system, IVR). Answers and data are analysed by a computer/AI, and this makes the test very cheap to administer at periodic intervals (annually, six-monthly, quarterly). If the analysis indicates a deficiency or a worsening trend, the system can alert the person's relatives (or executors, as chosen by the person), the government social services and elderly protection services departments, etc.
This system need not be for testing purposes alone; it can also be used as an education or "brain exercise" tool to keep senior citizens mentally sharp. If senior citizens can avail of some entertainment value through the system, they are more likely to use it - and it can form a more detailed assessment of their cognitive skills.

This infrastructure can also be used to inform and educate older adults and their caregivers about the risks of financial abuse of older adults.

FEASIBILITY. Researchers are already developing such scales and fine-tuning them for the elderly population: http://www.tandfonline.com/doi/abs/10.1080/08946566.2015.1078760 
Banks, wealth management institutions, and government agencies are increasingly concerned about the financial decision making capabilities of older individuals, and their risk for financial exploitation/abuse at the hands of relatives, household helpers, caregivers, scammers, etc. Such organizations can be potential partners and funders for developing the system.