Japan has a large amount of unused labor in the current demographic breakup of 29% elderly, Japan has a large number of educated inviduals, and Japan has a large amount of capital even without infinite growth shenanigans.

Any failure to take care elderly even at 38% or even 50% would be a failure of the state as a result of greed or corruption. It’s a relatively simple task to accomplish. The year is 2025, automation replaced most other jobs a long long time ago.