In Japan, one of the fastest-aging countries in the world, an estimated 1 in 4 people over the age of 65 has dementia or mild cognitive impairment. And Alzheimer¡¯s, the most common form of dementia, accounts for about two-thirds of all cases in the nation.

The condition could affect a family member, a neighbor ¡ª or even you someday.

But it¡¯s not all doom and gloom.