Hollywood star Brad Pitt knows he will struggle to keep his sex symbol status - because he is starting to show the "strains of life". Pitt, 43, admits family life with partner Angelina Jolie and their four children have taken its toll on his looks - but he has never been happier. He tells British magazine Cosmopolitan, "My face looks older and more mature now but I'm really happy with that. I'm showing the strains of life - and all that missing sleep."