A. It's true that some countries have issued extremely long term bonds with extremely low rates, for example, France and Spain each sold 50-year bonds in 2016 so these governments could lock in the low rates through 2066. The French government pays just 1.75 percent.
Why would investors find such long-term bonds attractive? A lack of options. Many nations have issued debt with negative yields. According to JP Morgan Chase, about $9 trillion of government debt, or about a third of the global total, has negative yield!