CNN’s Phil Mattingly expressed bewilderment on Monday that there has been so much focus on President Joe Biden’s age when former President Donald Trump isn’t exactly a portrait of lucidity himself. Mattingly’s remarks came in light of a recent poll showing that the overwhelming majority of Americans believe Biden is too old to be president, whereas a significantly smaller majority say the same thing about Trump. “If you watch all hour of any Donald Trump speech or event, there is at least ten to 12 minutes of complete incoherent rambling, flubbing who leads which country — Turkey being the la…