attackfighter
Emperor
They are starting to retire. Which isn't at all the same as starting to die. A 65 year old man today in America can reasonably expect to live to be 82. This assumes that medical technology doesn't show any significant advances in the next 20 years, which there assuredly will be. I'm not sure if having baby boomers stick around for another five election cycles is the same as saying they are "starting to die."
They've begun to die from old age and their death rate will rise exponentially as they get older. Life expectancy doesn't mean you're 100% likely to live to that age - but rather that it's the median age that people die at.