Former President Bill Clinton ignited social media backlash after making a rambling speech — which he delivered in a raspy voice with shaky hands — on the third night of the Democratic National Convention in Chicago. The frail-looking 42nd president took an ageist jab at former President Donald Trump by spotlighting his own decrepitude. “Let’s cut to the chase: I am too old to gild the lily,” Clinton muttered in a gravelly voice. “Two days ago, I turned 78 — the oldest man in my family for four generations. “And the only personal vanity I want to assert is I’m still younger than Donald Trump.”…