Yeah, thinking of Abe confused me here. I remember that he was in office very long and that he was shot, so I thought it's maybe not many former prime ministers being alive. But the recent change was not due to death, so I could exclude the answer "None". However, I somehow assumed that in Japanese culture elder people are more respected, making it plausible that rather old men are elected prime minister, so they might be all dead except few. Was hesitating between answer "1" and "4" and finally decided for "1". Well, wouldn't really make a difference, because both were wrong.

A bit sad, as I had the 9 questions before correct.

I was vaguely aware the UK had a base, but in the heat of the moment I went with USA since their military is so much bigger.

I'm a millennial. I remember learning about and using microfiche in elementary and middle school, and I later became much more familiar with it working in a library reference department as an adult. You're probably right that not many kids these days are familiar with it, though.