Nicole Kidman sees growing older as ''bittersweet''.The 'Paperboy' actress feels a lot ''better'' than she imagined she would aged 45 but realises, while looking after her elderly parents, her energy won't last forever so she tries to make the most of each day. She explained: ''[Being 45] is better [than I expected], but at the same time suddenly I'm dealing with my parents who are in their 70s and it's bittersweet because you know where it's heading. ''There's the beginning, there's the end and there's everything in between. The end obviously gets closer and you get older, but at the same time there's enormous joy and gratitude for each day.'' Nicole - who has daughters Sunday, four, and Faith, two, with husband Keith Urban and adopted kids, Isabella, 20, and 17-year-old Conor, with ex-husband Tom Cruise - views time as a ''precious'' gift and her main ambition in life now is to spend as much time as she can with her family. In an interview in the Daily Mirror newspaper, she explained: ''Time is so precious and it becomes more so as you get older. It comes into play with making decisions. ''My husband says, 'You can't buy time,' and that's why we always try to make decisions that mean our family is kept together because you just can't get that back.''