Interesting News on Lifespan

I read 2 articles this week (Thanks to the NEGHS Newsletter) that at first look appeared to be unrelated but as I processed the information, realized that they were indeed related.  The first, Life span has little to do with genes, analysis of large ancestry database shows by Sharon Begley clearly surprised me.  Not having a medical background, I assumed, wrongly it appears, that genes were a much stronger indicator to longevity.  The article is also interesting in that the data analyzed most likely included my people and yours, if you are an Ancestry.com member.  I have no problem with my tree info being shared for research purposes but if you do, and you didn't take the time to read the disclaimers when you were signing up, you need to be aware that your information is being used by third parties.
The second article, She was like a second mother': the German woman who saved our Jewish family history by Simon Finch drove home to me how fortunate my family has been in leaving areas of unrest in the nick of time.  Those that bravely fought for freedom, from Jacob Wilson Parrot,the First Congressional Medal of Honor awardee from the Civil War and my first cousin three times removed, to two Purple Heart recipients (WW I and II), George Bryant and George Willard Harbaugh, my husband's grandfather and uncle, all made it home safely.
Family mortality has always interested me.  Aside from the occasional accident, such as my great grandfather Frank Landfair falling off a train platform, to my Great Uncle Francis Earl Landfair, being struck my lightening while standing outside talking with friends, I attempted to deduce longevity by averaging the prior three generations of family members, taking into account gender, and adding two years for men and three for women to account for medical advancements.  This seemed to work for both my maternal and paternal sides.  I guess my data set was too small to make an inference.
I'd be interested to hear if you've looked at your ancestor's longevity and drawn any conclusions.  Let me know if you have!