New dementia index prediction tool

A new dementia index tool can apparently classify 88% of patients who will develop dementia in the next 6 years.
Of course, there is still nothing you can do to prevent or truly treat dementia, but at least you can enjoy your remaining dementia-free years and hope for a cure, right?
However, it only works if you are over 65; wouldn't have helped my dad (diagnosed at age 62). A 15-point index including both conventional and newly identified risk factors for the conditions correctly classified 88 percent of patients according to their risk of developing dementia within six years.
Every 70 seconds, someone gets dementia.  That's depressing.
My dad was such an unusual case.  He never fits the stereotypes I read about.  Here is what this test looks at:

older age, lower scores on two tests of cognitive function, presence of at least one of the known genetic variations linked to Alzheimer's, below-normal weight, abstinence from alcohol, a history of coronary artery bypass surgery, and a slow time putting on and buttoning a shirt

He was not of older age or underweight and he drank beer daily.  He did not have heart problems until a year before he died and he put on a button shirt every day until he retired.
The test is not perfected and not available for general use yet.

(Screenprint of original; picture source=article source)