|4 Generations: Photo by Jun's World.|
122 = The maximum human life span.
85 = The average life expectancy for women in the US who reach age 65.
82 = The average life expectancy for men in the US who reach age 65.
77 = The average life expectancy for those in the US measured from birth.
First, it's important to know the difference between life span and life expectancy.
Life span is the maximum number of years that a species can live. It's the upper limit. For humans, this is 122 years. Jean Calment holds the record for the oldest documented living person at 122 years and 164 days.
Life expectancy is the statistically expected number of years projected for a person's length of life.