Four decades on, Argentina's 'Mothers' still marching Just as she does every Thursday, Taty Almeida ties her white scarf around her head, grabs her cane and joins her fellow octogenarian protesters to march around the square outside Argentina's pink presidential palace. The Mothers of May Square -- Madres de la Plaza de Mayo in Spanish -- turns 40 this week, a milestone that finds its members increasingly frail but ever determined to see their children's killers brought to justice.