Jane, who is an 85 - year - old widow, often struggles to calculate how much of her favorite food she needs to buy and usually opts for ready - made meals that can be heated in the microwave. Her daughter comes on Saturdays to help her with the bills, portion out her weekly medications into pill boxes and shop with her. Given that the above passage mentions some reasons for the decline in the cognitive function of the elderly, as a person knowledgeable about the cognitive function problems of the elderly, what understanding and intervention measures are necessary?