Why aren’t the oldest living people getting any older? – By Will Oremus – Slate Magazine:

Young calls this the “rectangularization of the mortality curve.” To illustrate it, he points to Japan, which in 1990 had 3,000 people aged 100 and over, with the oldest being 114. Twenty years later, Japan has an estimated 44,000 people over the age of 100 and the oldest is still 114.