Yes, 21,000 pounds is worth it to prolong someone's life for six months, because anyone in that situation would want their life preserved. A person should not have to look at a cost and be told that their life is not worth it. All life-saving measures should be taken, because we do not let people die because of costs.
Yes, if 21,000GBP was spent to prolong someone's life for only six months, it would be worth spending. If some one is about to die and if there is a way that you can make their life a little bit longer so they can enjoy all the great things in life, that would be worth no amount that money could buy.
If 21,000GBP was spent to prolong someone's life for only six months, it was worth spending. There is no price that can be placed upon a human life. Money does not go with you when you die and you should not hold onto it because you do not know what will happen tomorrow. We should not value money especially when it is dealing with human life.
We as humans do not decide where we begin, but we can decide where we go from there. Quality of life is not measured in years, or months, or days. It is measured in experience, in the lives of those you have touched and in the things that you have done. Those who have lived out their lives according to their beliefs have attained fulfillment. To prolong a life is to cheat them of that. It is to say that they are not ready to die and that they have not lived enough. You could argue that prolonging someone's life is akin to justifying mediocrity. Regardless of the dollar amount, prolonging a life is not worth it without a real cause.
If someone were a young adult with young children that might be worth it. But really we are all going to die and to spend huge amounts of effort and money to prolong life, especially if the quality is not going to be that much better, is just a waste of resources.
I mean I guess it would depend on whether or not the person wanted it to be spent for that purpose. It would also depend on who was spending the money and if they could afford it. Also, what would the person's quality of life be for those 6 months?