Japan's GDP growth is actually good for an advanced economy, when you index it to the size of the working-age population.[1]
Japan's working-age population has been shrinking for quite a while now.
(China's is peaking about now, so it can expect total growth to slow down. Hence the measures taken by the CCP to try to increase fertility: lifting the one-child policy to three children, introducing tax breaks, limiting for-profit tutoring, and most recently cracking down on alternatives to making babies: video games and on-line shopping and social media.)
1. Japan's working age population peaked in 1997: https://fred.stlouisfed.org/series/LFWA64TTJPM647S
Basically, if you for whatever reason become/are somewhat disabled, cognitively impaired, lose your family, are simply getting quite old and losing the ability to do what you used to, etc, there will always be some sort of job, often falling under the bloat of what you've listed after "on the other hand", that you'll be able to do if you want to, that will give you a stable income (even if small) and get you out of the house or whatever else and somewhere that you'll have a routine form of socialization amongst your co-workers and such.
Hanko: https://en.wikipedia.org/wiki/Seal_(East_Asia)#Japanese_usag...
LOL, that's not even wrong.