Marc Jacobs's meticulously crafted, extraordinarily thought-out Fall 2019 show culminated with an old friend, Christy Turlington, taking the runway at 50. "I turned 50 this year and have arrived at a place where 'Why the F not' is the answer that comes up when I ask myself questions," Christy wrote on Instagram, explaining how grateful she was to meet Marc's young cast of models who she hopes her daughter aspires to be like. Marc's idea to have Christy wear one of the most glamorous looks in his lineup proves that fashion has no age limits — and it should always be so.