Sometimes it’s hard to say good-bye. Last week, former Vice President Joe Biden—at 76 years of age and counting—became the twentieth announced Democratic candidate for President.  As many have noted, he’s not even the oldest aspirant in the field. That would be 77 year old Senator Bernie Sanders, running again after coming in second to Hillary Clinton in the Democratic primary in 2016.  Both white males are vying to replace another white male, 72 year old Donald Trump. So much for the generational change with diverse candidates who look more like America that was to occur when the 47 year old Barack Obama assumed the presidency in 2009.  Not to mention the glass ceiling, which remains very much in place. Knowing how and when to step aside for a more diverse, younger generation of leaders is very much front page news for the Democratic Party as the nation heads into another presidential election cycle. A recent Suzanna Danuta Walters op-ed in the Washington Post argues that male politicians “have a responsibility—if they really do want …