For the [past / passed] 100 years, people believed middle age to be around 50 years old. This is when we [started / start] to grow 'old'. However, new research says we have to change this. A study [of / from] the International Institute for Applied Systems Analysis (IIAS) in Austria and Stony Brook University in New York says middle age now starts at 60 or [eventually / even] 65, or older. Why? The biggest reason is that we are [living / live] living . We are also [healthier / healthiest] , we have better diets, we exercise [most / more] and we have more money to live a [nicer / nicely] lifestyle. The IIAS said: "Since life [expectancies / expectant] have increased over the past several decades, and are continuing to increase, people once considered 'old' should actually be viewed [as / was] more middle aged." The study was not a worldwide one [so / as] perhaps not everyone in all countries can say they are middle aged when they are 65. The researchers looked at [population / populations] in 39 European countries, so this is good news [for / from] Europeans. Britain's National Health Service warned [for / against] looking at this study and believing it to [have / be] 100 per cent true. It said the researchers did not look at things [which / so] could reduce life expectancy: "We don't know whether, for example, they [factored / factoring] in the possible impact [of / for] being unable to treat infections because of rising antibiotic [resistant / resistance] , or the increased numbers of people with diabetes due to obesity." It recommended healthy living, eating and exercise as a way to [live / lively] longer.