Mel B, aka Melanie Brown, at the 5th Biennial Stand Up To Cancer held at the Walt Disney Concert Hall in Los Angeles. — Photo by PopularImages *Mel B says the age gap between her and husband Rory McPhee is wider than people might assume, and she insists it doesn’t bother her. The Spice Girls alum, 51, spoke with Yahoo’s “Unapologetically” series about her marriage and her outlook on aging. When asked about having a “slight age gap” with McPhee, …