I believe parents age at death is a strong indicator of the age we can expect to live to. There is a website you can go to and answer a lot of questions which will calculate your life expectancy. I think it's realage.com.
Every one is different. Some heavy drinkers' livers give out in their 40s, some in their 50s, etc. My dad has been going at it hard for decades. We did not think he would make it to 60 and he is now over 70.