My 4.5yo still naps. She really needs it and doesn't fight it. There have been times when we've been out and about and she didn't get to nap until late (tonight for example, she flll asleep at 4 and got up at 6) or at times, she falls asleep before dinner. I don't really worry about it too much - I figure she knows her body and if she wakes up, I give her a snack and she goes back to sleep. But, I do try to plan for naps because she still needs them so much.