Gwyneth Paltrow thinks every stage of her children’s lives has been “better than the last”. The ‘Iron Man’ actress admitted she couldn’t imagine parenthood being any more satisfying than when her kids Apple, now 18, and 16-year-old Moses – who she has with ex-husband Chris Martin – were babies but she has embraced “each chapter” they have gone through and learned to savour the moments. She told People magazine: “My daughter went to college in the fall, and my son is growing up every minute. “He’s taller than me. But I’m very grateful for the transitions. Especially as a mother, I’ve really che…