"It may be taken as a nonsensical remark from the person in his dotage who is not at all capable of taking the responsibility... an old man with no future, as it is too much for him to serve out two-year remainder of his office term."

Said Kim Yo-jong, quoted in "North Korea: Kim Jong-un sister says Joe Biden is ‘in his dotage’ as she criticises nuclear pact/Kim Yo-jong’s broadside came after US and South Korea enhance nuclear cooperation and Biden warns Pyongyang an attack would end the regime" (The Guardian).