They have found that thos individuals that live into their 90's have a genetic variation in the cholesterol gene. The cholesterol particles in there blood tend to be really big. A supersized gene. "We basically think the size is necessary for longevity," Barzilai said.
http://story.news.yahoo.com/news?tmpl=story&cid=624&ncid=624&e=2&u=/ap/20031014/ap_on_sc/longevity_gene_variation_2
http://story.news.yahoo.com/news?tmpl=story&cid=624&ncid=624&e=2&u=/ap/20031014/ap_on_sc/longevity_gene_variation_2