Is it common for people to live into their mid-80s?
This is an interesting question. The average lifespan is 78 years or so, but this includes people that pass away while they are still young.
Once you reach the age of 67, your life expectancy is 85 years if you are a man, and it is 87 years for a woman. You become eligible for a full Social Security benefit when you are between 66 and 67. If you think you will live long enough to get a benefit, this will be your life expectancy.