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 — or even you, decades from now.

But it’s not all doom and gloom.