Diaz`s derriere getting better with age

London: Actress Cameron Diaz says her bum is getting better with age because of her fitness and exercise regime. She will turn 40 in August. "My ass is definitely higher than it was when I was 20! But this is the thing that people don`t understand - take care of your body (and it will) get better! It gets better as I get older," a website has quoted Diaz as saying. IANS