The average age for an S&P 1500 corporate director has inched forward in the past seven years, going from 61 to 64, meaning that companies are either taking on older board candidates than before, or current directors are staying on for longer, according to a recent study done by analysis firm Equilar. Further data from Equilar shows, actually, that it's a little bit of both: median age of new directors has increased a little bit, growing 2 percent since 2007, and average tenure has inched higher as well, with the average director in 2014 had been a board member for over one year longer compared to 2007.