Wakamiya is a former banker who clocked 43 years of service at a major Japanese bank, and only learned how to use computers when she was 60.
In the app, named Hinadan — a combination of the words hina, a type of doll, and dan, meaning “tier” — the player must position 12 dolls in their correct positions on a display with four tiers.
After the player finishes the game, a congratulatory message pops up.
The vibrant lady also runs a club for other retirees on active ageing called the Mellow Club.
Here she is featured at a TEDx talk in Tokyo, where she talked about active ageing in the digital world.