If you add up the vote share of the four "conspiracy parties" you get
60% for the teenagers
63% for the 20s (zoomers)
58% for the 30s (millennials)
Though remember that this is just exit poll vote share—in absolute terms, the under-40s are a demographic minority in Japan (only around 26mn voters)
The parties that push the MoF conspiracy theory are Reiwa, Sanseito, Kokumin and Hoshuto
They’re what I call “the conspiracy parties” and they’ve all gained seats today
As the article mentions, the MoF theory also intersects with anti-vax and anti-immigration theories, also salient this election