These days, modern medicine can extend your life when your genetics and health lifestyle would not otherwise have allowed it.
This is not all good, in fact, I hate to tell you but if you are feeble, wheelchair bound and suffer from even mild dementia at age 80 living until you are 90 is not going to be pleasant, even if you are filthy rich. AND awful if you are not at least very well off financially and have direct family support.