The difference between living to 90 and living past 105 seems to depend largely on genes, according to a study of siblings.
For people who live to 90 years old, the chance of their siblings also reaching age 90 is relatively small—about 1.7 times greater than for the average person born around the same time.But for people who survive to age 95, the chance of a sibling living to the same age is 3.5 times greater—and for those who live to 100, the chance of a sibling reaching the same age grows to about nine times greater.
