Madonna on fighting ageism: “It’s about staying curious, staying alive, and working on making ourselves feel good’

Madonna calls at 9 a.m. from Portugal. The singer and mother with just a first name is on the phone to talk about her newest project: skin care. She’s obsessed with it like everyone else, and launched her own line, MDNA Skin, this year. The Cut talked to Madonna about having glowy butt skin, her newest product (MDNA’s Reinvention Cream),…