Eva Maria Bucher-Haefner

Eva Maria Bucher-Haefner's fortune largely stems from her stake in American IT management software maker CA Technologies.She inherited half of her father Walter's stake in the business when he died in June 2012, then the world's oldest billionaire at 101.She also inherited part of car dealer AMAG, which sells brands including Volkswagen, Audi, Bentley and Porsche.Her brother, Martin Haefner, is also a billionaire and inherited equal stakes in CA Technologies and AMAG.She runs Moyglare, a 500-acre horse farm in Ireland that was purchased by her father in 1962, home to around 100 horses today.