Why are the Democrats running for president so old? Blame the Clintons.

There are five Democrats who have either declared or are thinking about running for president. Three — Joe Biden, Bernard Sanders, and Jim Webb — will be over 70 years old on Inauguration Day 2017. Frontrunner Hillary Clinton will be nine months short of 70. Only Martin O’Malley, who will turn 54 a couple of days before the 2017 swearing-in, has not reached retirement age already.