"some losing" and "some loosing": what difference? "some losing" and "some loosing": what difference?

How to fill sentence within the meaning? "Some people choose to resign/retire when they are sixty-two". resign or retire?

Is it exist: "inneverable" or smt like this? I listen english dialogs and had heard words(or phrase), which sound like "inneverable"("unneverable"). Formed from "never". Is it possible?

20:00 (or 20 p.m.) = twenty hundread. How ofter doesit use?

Im wondering of this phrase: "Lets just put it to the side". Is it correct? Or maybe I must use "aside"?