'Useful' in the Bible

I am this day eighty years old. Can I [be useful to advise you to] discern between good and bad? Can your servant taste what I eat or drink? Can I still hear the voices of singing men and women? Why then should your servant be an added burden to my lord the king?

So his servants said to him, “Let a young virgin be found for my lord the king and let her attend him and become his nurse; let her lie against your chest, so that my lord the king may feel warm.”

The righteous will flourish like the date palm [long-lived, upright and useful];They will grow like a cedar in Lebanon [majestic and stable].

Notice this, even when it was complete, it was not useful and was not made into anything. How much less, after the fire has burned [part of] it and [the remainder of] it is charred, can it still be made into anything?