It’s a sobering figure. To prepare for just four additional years of life span over current projections, someone who’s 50 years old now would need an additional $160,000 in retirement savings to maintain a modest lifestyle, experts say. And it seems that, over the next several decades, many more people will need to shore up their retirement plans: Since 1940, American men have gained about a year of life expectancy — and American women, 1.1 years — with every five-year period. For life insurers, this means that now is a very good time to rethink their underwriting manuals. For consumers, it means that life insurance is much easier to get today than it was ten or twenty years ago — even people who have suffered from heart disease or cancer will often have a high life expectancey, making their applications much easier to approve.