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It is becoming clear that people's lifespan is generally increasing because of many reasons. I think that the progress in medical fields and apparatus has the most significant influence on the longer life of human.
First of all, the development of science resulted in improved medical techniques and medicines which affects the longer lifespan of people. People who suffer from fatal diseases can be recovered more easily and quickly by many evolved treatment. On the other hand, in the past, there were so many tragic deaths resulted from non-fatal ailments due to the lack of proper remedy. For example, my cousin suffered from a diabetes which is hereditary ailments in his family. When he got to know the disease, he immediately went to a hospital and got effective medicines and suitable treatments regularly from a doctor.(같이 병렬로 가는 것이 좋음) As a result, now he is very healthy. However, he told me that if there was were some drugs for diabetes in the past, his father would not have died like that early. This shows that how influential the improvement of modern medical techniques is to the longer lifespan of human.
Also, it is no wonder that modern people have huge opportunities to stay healthy. One significant reason is that there are so many convenient tools to help promoting healthy life such as gym facilities in a village, broad park to enjoy jogging, and health apparatus(이건 위에 facility 와 같다고 생각됨) which can be used indoor like a running machine.(써줄 필요없다고 생각됨) People can enjoy excercise easily with them. For instance, according to a recent study, people living in a village having which is equipped with a public gym has a better health state than people living in a town which has no gym facilities. From my personal experiences, the study can be proved. When I was a students, a new complex gym facility was built in close proximity to my apartment. The gym provided various excercise spaces such as swimming pool, basketball court, and bowling center. Whenever I had a spare time, I went to the gym with my family and I could be free from trivial diseases like a flu I caught every winter.
In short, I believe that extended lifespan is contributed by the developed medical techniques and various methods that provide chance to excercise.