Source: Bang Showbiz NewsHarry Styles wants a girl who is "driven" and "ambitious" in their career.The 18-year-old singer - who stars in One Direction alongside Louis Tomlinson, Niall Horan, Liam Payne and Zayn Malik - is best known for dating older women including 32-year-old Caroline Flack and Lucy Horobin, also 32, but admits he would be happy with a woman of any age as long as they were "driven". He said: "I find ambition really attractive - if someone's good at something they love doing. I want someone who is driven."His bandmate Louis also reveals his secret to his successful relationship with student girlfriend Eleanor Calder, and believes trust is pivotal to their often long-distance link.He told Cosmopolitan magazine: "We trust each other - I spend a lot of time out of the country on tour. But she often flies out."I think the key to a good relationship is being best friends. I spend more time with her and the band than I do with anyone else. She's really great."All three other members of the band have links with famous women; Liam is rumoured to be dating Leona Lewis, Zayn is in a relationship with Little Mix's Perrie Edwards and Niall has revealed his love for Demi Lovato.