Let's face it, wearing black is easy. The real challenge is color. When I was in my late teens I wore black almost exclusively and in my dramatic woeful way related to the opening lines of Chekhov's The Seagull answer to why the lead always wore black: "I'm in mourning for my life."
Sure it looks cool in your 20s (and is always slimming) but at a certain point it starts to age the face. It can emphasize wrinkles under the chin and on the face. Highlight shadows under the eyes. At least bring a splash of color around your face. A scarf, a blouse under a black jacket, or a chunky necklace can help dramatically. More color for your style