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Would you like to know when you’ll die? It’s a question for many, but one which could be answered using a blood test. Spanish scientists have invented such a test that they say will estimate how much you will live. The $700 test measures the length of telomeres in our DNA. Telomeres control how often our cells to make new ones and are thus responsible for aging. They the length of our lifespan. The company the project, Life Length, says the test will give people an of the speed at which they are ageing and a prediction of when the end might . Critics have been quick to attack the test. They say it is unethical, unreliable, and could to insurance firms demanding people take the test issuing policies.

Researchers say the test could lead to breakthroughs in -related illnesses such as Alzheimer's and heart disease. Professor Jerry Shay, a consultant for Life Length, admitted people are to be wary of the new test. He said: "People say, 'If I know I'm going to die in 10 years, I'll all my money now', or 'If I'm going to live for 40 years, I'll be conservative in my lifestyle'. He added: "The worrying thing is that if this information ever got to a where it is believable, insurance companies would requiring it in terms of insuring people.” Maria Blasco, of the test, believes it is important, saying: "It will be for you to know your biological age. Maybe you would change your lifestyle if you find you have short telomeres."